diff --git a/modules/flowable-bpmn-converter/src/main/java/org/flowable/bpmn/constants/BpmnXMLConstants.java b/modules/flowable-bpmn-converter/src/main/java/org/flowable/bpmn/constants/BpmnXMLConstants.java
index 67a59b8247f..6a93b87b890 100644
--- a/modules/flowable-bpmn-converter/src/main/java/org/flowable/bpmn/constants/BpmnXMLConstants.java
+++ b/modules/flowable-bpmn-converter/src/main/java/org/flowable/bpmn/constants/BpmnXMLConstants.java
@@ -245,6 +245,7 @@ public interface BpmnXMLConstants {
 
     public static final String ATTRIBUTE_BUSINESS_KEY = "businessKey";
     public static final String ATTRIBUTE_INHERIT_BUSINESS_KEY = "inheritBusinessKey";
+    public static final String ATTRIBUTE_INHERIT_VARIABLES = "inheritVariables";
     public static final String ATTRIBUTE_SAME_DEPLOYMENT = "sameDeployment";
     public static final String ATTRIBUTE_CALLED_ELEMENT_BINDING = "calledElementBinding";
     public static final String ATTRIBUTE_FALLBACK_TO_DEFAULT_TENANT = "fallbackToDefaultTenant";
diff --git a/modules/flowable-bpmn-converter/src/main/java/org/flowable/bpmn/converter/ServiceTaskXMLConverter.java b/modules/flowable-bpmn-converter/src/main/java/org/flowable/bpmn/converter/ServiceTaskXMLConverter.java
index 2a12c652376..31cc245c387 100644
--- a/modules/flowable-bpmn-converter/src/main/java/org/flowable/bpmn/converter/ServiceTaskXMLConverter.java
+++ b/modules/flowable-bpmn-converter/src/main/java/org/flowable/bpmn/converter/ServiceTaskXMLConverter.java
@@ -76,6 +76,7 @@ public class ServiceTaskXMLConverter extends BaseBpmnXMLConverter {
             new ExtensionAttribute(ATTRIBUTE_CASE_TASK_CASE_INSTANCE_NAME),
             new ExtensionAttribute(ATTRIBUTE_BUSINESS_KEY),
             new ExtensionAttribute(ATTRIBUTE_INHERIT_BUSINESS_KEY),
+            new ExtensionAttribute(ATTRIBUTE_INHERIT_VARIABLES),
             new ExtensionAttribute(ATTRIBUTE_SAME_DEPLOYMENT),
             new ExtensionAttribute(ATTRIBUTE_FALLBACK_TO_DEFAULT_TENANT),
             new ExtensionAttribute(ATTRIBUTE_ID_VARIABLE_NAME));
@@ -236,6 +237,9 @@ protected void writeCaseServiceTaskAdditionalAttributes(BaseElement element, Bpm
         if (caseServiceTask.isInheritBusinessKey()) {
             writeQualifiedAttribute(ATTRIBUTE_INHERIT_BUSINESS_KEY, "true", xtw);
         }
+        if (caseServiceTask.isInheritVariables()) {
+            writeQualifiedAttribute(ATTRIBUTE_INHERIT_VARIABLES, "true", xtw);
+        }
         if (caseServiceTask.isSameDeployment()) {
             writeQualifiedAttribute(ATTRIBUTE_SAME_DEPLOYMENT, "true", xtw);
         }
@@ -432,6 +436,7 @@ protected void convertCaseServiceTaskXMLProperties(CaseServiceTask caseServiceTa
 
         caseServiceTask.setBusinessKey(BpmnXMLUtil.getAttributeValue(ATTRIBUTE_BUSINESS_KEY, xtr));
         caseServiceTask.setInheritBusinessKey(Boolean.parseBoolean(BpmnXMLUtil.getAttributeValue(ATTRIBUTE_INHERIT_BUSINESS_KEY, xtr)));
+        caseServiceTask.setInheritVariables(Boolean.parseBoolean(BpmnXMLUtil.getAttributeValue(ATTRIBUTE_INHERIT_VARIABLES, xtr)));
         caseServiceTask.setSameDeployment(Boolean.valueOf(BpmnXMLUtil.getAttributeValue(ATTRIBUTE_SAME_DEPLOYMENT, xtr)));
         caseServiceTask.setFallbackToDefaultTenant(Boolean.valueOf(BpmnXMLUtil.getAttributeValue(ATTRIBUTE_FALLBACK_TO_DEFAULT_TENANT, xtr)));
         caseServiceTask.setCaseInstanceIdVariableName(BpmnXMLUtil.getAttributeValue(ATTRIBUTE_ID_VARIABLE_NAME, xtr));
diff --git a/modules/flowable-bpmn-converter/src/test/java/org/flowable/editor/language/xml/CaseServiceTaskConverterTest.java b/modules/flowable-bpmn-converter/src/test/java/org/flowable/editor/language/xml/CaseServiceTaskConverterTest.java
index 809420b30ab..77000c8ca45 100644
--- a/modules/flowable-bpmn-converter/src/test/java/org/flowable/editor/language/xml/CaseServiceTaskConverterTest.java
+++ b/modules/flowable-bpmn-converter/src/test/java/org/flowable/editor/language/xml/CaseServiceTaskConverterTest.java
@@ -37,6 +37,7 @@ void validateModel(BpmnModel model) {
 
         assertThat(caseServiceTask.isFallbackToDefaultTenant()).isTrue();
         assertThat(caseServiceTask.isSameDeployment()).isFalse();
+        assertThat(caseServiceTask.isInheritVariables()).isTrue();
 
         List<IOParameter> parameters = caseServiceTask.getInParameters();
         assertThat(parameters)
diff --git a/modules/flowable-bpmn-converter/src/test/resources/caseservicetask.bpmn b/modules/flowable-bpmn-converter/src/test/resources/caseservicetask.bpmn
index b36c3c4b8b1..a783a913836 100644
--- a/modules/flowable-bpmn-converter/src/test/resources/caseservicetask.bpmn
+++ b/modules/flowable-bpmn-converter/src/test/resources/caseservicetask.bpmn
@@ -9,7 +9,7 @@
     targetNamespace="http://www.flowable.org/test">
     
   <process id="process" name="process1" isExecutable="true">
-    <serviceTask id="caseServiceTask" flowable:type="case" name="Case task" flowable:caseDefinitionKey="caseId" flowable:fallbackToDefaultTenant="true">
+    <serviceTask id="caseServiceTask" flowable:type="case" name="Case task" flowable:caseDefinitionKey="caseId" flowable:fallbackToDefaultTenant="true" flowable:inheritVariables="true">
       <extensionElements>
         <flowable:in source="test" target="test"></flowable:in>
         <flowable:in sourceExpression="${test}" target="test"></flowable:in>
diff --git a/modules/flowable-bpmn-model/src/main/java/org/flowable/bpmn/model/CaseServiceTask.java b/modules/flowable-bpmn-model/src/main/java/org/flowable/bpmn/model/CaseServiceTask.java
index bc6460f439a..4940d1af81f 100644
--- a/modules/flowable-bpmn-model/src/main/java/org/flowable/bpmn/model/CaseServiceTask.java
+++ b/modules/flowable-bpmn-model/src/main/java/org/flowable/bpmn/model/CaseServiceTask.java
@@ -25,6 +25,7 @@ public class CaseServiceTask extends ServiceTask implements HasOutParameters, Ha
     protected boolean sameDeployment;
     protected String businessKey;
     protected boolean inheritBusinessKey;
+    protected boolean inheritVariables;
     protected boolean fallbackToDefaultTenant;
     protected String caseInstanceIdVariableName;
     
@@ -71,6 +72,14 @@ public void setInheritBusinessKey(boolean inheritBusinessKey) {
         this.inheritBusinessKey = inheritBusinessKey;
     }
 
+    public boolean isInheritVariables() {
+        return inheritVariables;
+    }
+
+    public void setInheritVariables(boolean inheritVariables) {
+        this.inheritVariables = inheritVariables;
+    }
+
     public boolean isFallbackToDefaultTenant() {
         return fallbackToDefaultTenant;
     }
@@ -131,6 +140,7 @@ public void setValues(CaseServiceTask otherElement) {
         setCaseInstanceName(otherElement.getCaseInstanceName());
         setBusinessKey(otherElement.getBusinessKey());
         setInheritBusinessKey(otherElement.isInheritBusinessKey());
+        setInheritVariables(otherElement.isInheritVariables());
         setSameDeployment(otherElement.isSameDeployment());
         setFallbackToDefaultTenant(otherElement.isFallbackToDefaultTenant());
         setCaseInstanceIdVariableName(otherElement.getCaseInstanceIdVariableName());
diff --git a/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/CaseTaskXmlConverter.java b/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/CaseTaskXmlConverter.java
index 4a0bd67fd22..6edd7c848e5 100644
--- a/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/CaseTaskXmlConverter.java
+++ b/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/CaseTaskXmlConverter.java
@@ -44,6 +44,11 @@ protected CmmnElement convert(XMLStreamReader xtr, ConversionHelper conversionHe
             caseTask.setInheritBusinessKey(Boolean.parseBoolean(inheritBusinessKey));
         }
 
+        String inheritVariables = xtr.getAttributeValue(CmmnXmlConstants.FLOWABLE_EXTENSIONS_NAMESPACE, CmmnXmlConstants.ATTRIBUTE_INHERIT_VARIABLES);
+        if (inheritVariables != null) {
+            caseTask.setInheritVariables(Boolean.parseBoolean(inheritVariables));
+        }
+
         String fallbackToDefaultTenantValue = xtr.getAttributeValue(CmmnXmlConstants.FLOWABLE_EXTENSIONS_NAMESPACE, CmmnXmlConstants.ATTRIBUTE_FALLBACK_TO_DEFAULT_TENANT);
         if (fallbackToDefaultTenantValue != null) {
             caseTask.setFallbackToDefaultTenant(Boolean.valueOf(fallbackToDefaultTenantValue));
diff --git a/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/CmmnXmlConstants.java b/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/CmmnXmlConstants.java
index fce5fd993ce..f1bf6797d1c 100644
--- a/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/CmmnXmlConstants.java
+++ b/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/CmmnXmlConstants.java
@@ -142,6 +142,7 @@ public interface CmmnXmlConstants {
     String ATTRIBUTE_FALLBACK_TO_DEFAULT_TENANT = "fallbackToDefaultTenant";
     String ATTRIBUTE_BUSINESS_KEY = "businessKey";
     String ATTRIBUTE_INHERIT_BUSINESS_KEY = "inheritBusinessKey";
+    String ATTRIBUTE_INHERIT_VARIABLES = "inheritVariables";
     String ATTRIBUTE_ID_VARIABLE_NAME = "idVariableName";
 
     String ELEMENT_CASE_REF_EXPRESSION = "caseRefExpression";
diff --git a/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/ProcessTaskXmlConverter.java b/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/ProcessTaskXmlConverter.java
index c614f5fdc3f..67aab2d3f09 100644
--- a/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/ProcessTaskXmlConverter.java
+++ b/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/ProcessTaskXmlConverter.java
@@ -44,6 +44,11 @@ protected CmmnElement convert(XMLStreamReader xtr, ConversionHelper conversionHe
             processTask.setInheritBusinessKey(Boolean.parseBoolean(inheritBusinessKey));
         }
 
+        String inheritVariables = xtr.getAttributeValue(CmmnXmlConstants.FLOWABLE_EXTENSIONS_NAMESPACE, CmmnXmlConstants.ATTRIBUTE_INHERIT_VARIABLES);
+        if (inheritVariables != null) {
+            processTask.setInheritVariables(Boolean.parseBoolean(inheritVariables));
+        }
+
         String fallbackToDefaultTenantValue = xtr.getAttributeValue(CmmnXmlConstants.FLOWABLE_EXTENSIONS_NAMESPACE, CmmnXmlConstants.ATTRIBUTE_FALLBACK_TO_DEFAULT_TENANT);
         if (fallbackToDefaultTenantValue != null) {
             processTask.setFallbackToDefaultTenant(Boolean.parseBoolean(fallbackToDefaultTenantValue));
diff --git a/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/export/AbstractChildTaskExport.java b/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/export/AbstractChildTaskExport.java
index d90c74482c3..52a28773b6c 100644
--- a/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/export/AbstractChildTaskExport.java
+++ b/modules/flowable-cmmn-converter/src/main/java/org/flowable/cmmn/converter/export/AbstractChildTaskExport.java
@@ -32,6 +32,9 @@ protected void writePlanItemDefinitionSpecificAttributes(T planItemDefinition, X
         if (planItemDefinition.isInheritBusinessKey()) {
             xtw.writeAttribute(FLOWABLE_EXTENSIONS_PREFIX, FLOWABLE_EXTENSIONS_NAMESPACE, ATTRIBUTE_INHERIT_BUSINESS_KEY, String.valueOf(planItemDefinition.isInheritBusinessKey()));
         }
+        if (planItemDefinition.isInheritVariables()) {
+            xtw.writeAttribute(FLOWABLE_EXTENSIONS_PREFIX, FLOWABLE_EXTENSIONS_NAMESPACE, ATTRIBUTE_INHERIT_VARIABLES, String.valueOf(planItemDefinition.isInheritVariables()));
+        }
     }
 
     @Override
diff --git a/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/CaseTaskCmmnXmlConverterTest.java b/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/CaseTaskCmmnXmlConverterTest.java
index ba068d43693..5673f927e53 100644
--- a/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/CaseTaskCmmnXmlConverterTest.java
+++ b/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/CaseTaskCmmnXmlConverterTest.java
@@ -52,6 +52,7 @@ public void validateModel(CmmnModel cmmnModel) {
                     assertThat(task1.getCaseRefExpression()).isEqualTo("caseDefinitionKey");
                     assertThat(task1.getFallbackToDefaultTenant()).isTrue();
                     assertThat(task1.isSameDeployment()).isTrue();
+                    assertThat(task1.isInheritVariables()).isTrue();
 
                     assertThat(task1.getInParameters())
                             .extracting(IOParameter::getSource, IOParameter::getTarget)
diff --git a/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/ProcessTask2CmmnXmlConverterTest.java b/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/ProcessTask2CmmnXmlConverterTest.java
index f17798afaa8..3d9085494e5 100644
--- a/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/ProcessTask2CmmnXmlConverterTest.java
+++ b/modules/flowable-cmmn-converter/src/test/java/org/flowable/test/cmmn/converter/ProcessTask2CmmnXmlConverterTest.java
@@ -49,6 +49,7 @@ public void validateModel(CmmnModel cmmnModel) {
                 .isInstanceOfSatisfying(ProcessTask.class, task1 -> {
                     assertThat(task1.getProcessRefExpression()).isEqualTo("myTestProcess");
                     assertThat((task1.isSameDeployment())).isTrue();
+                    assertThat(task1.isInheritVariables()).isTrue();
 
                     assertThat(task1.getInParameters()).isEmpty();
                     assertThat(task1.getOutParameters()).isEmpty();
diff --git a/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/case-task.cmmn b/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/case-task.cmmn
index c3bc7d5baff..39e9965347f 100644
--- a/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/case-task.cmmn
+++ b/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/case-task.cmmn
@@ -21,7 +21,7 @@
             </sentry>
 
             <task id="theTask" name="The Task" isBlocking="true" />
-            <caseTask id="theCase" isBlocking="true" flowable:fallbackToDefaultTenant="true" flowable:sameDeployment="true">
+            <caseTask id="theCase" isBlocking="true" flowable:fallbackToDefaultTenant="true" flowable:sameDeployment="true" flowable:inheritVariables="true">
                 <extensionElements>
                     <flowable:in source="testSource" target="testTarget"></flowable:in>
                 </extensionElements>
diff --git a/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/process-task2.cmmn b/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/process-task2.cmmn
index 2a4754d68f4..31dcabbacef 100644
--- a/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/process-task2.cmmn
+++ b/modules/flowable-cmmn-converter/src/test/resources/org/flowable/test/cmmn/converter/process-task2.cmmn
@@ -17,7 +17,7 @@
           <modeler:initiator-can-complete xmlns:modeler="http://flowable.org/modeler"><![CDATA[false]]></modeler:initiator-can-complete>
         </extensionElements>
       </humanTask>
-      <processTask id="oneprocesstask1" name="Process task" flowable:sameDeployment="true">
+      <processTask id="oneprocesstask1" name="Process task" flowable:sameDeployment="true" flowable:inheritVariables="true">
         <processRefExpression><![CDATA[myTestProcess]]></processRefExpression>
       </processTask>
     </casePlanModel>
diff --git a/modules/flowable-cmmn-engine-configurator/src/main/java/org/flowable/cmmn/engine/configurator/impl/cmmn/DefaultCaseInstanceService.java b/modules/flowable-cmmn-engine-configurator/src/main/java/org/flowable/cmmn/engine/configurator/impl/cmmn/DefaultCaseInstanceService.java
index 9445e972b79..f373e9f0c7a 100644
--- a/modules/flowable-cmmn-engine-configurator/src/main/java/org/flowable/cmmn/engine/configurator/impl/cmmn/DefaultCaseInstanceService.java
+++ b/modules/flowable-cmmn-engine-configurator/src/main/java/org/flowable/cmmn/engine/configurator/impl/cmmn/DefaultCaseInstanceService.java
@@ -53,7 +53,7 @@ public String generateNewCaseInstanceId() {
 
     @Override
     public String startCaseInstance(String caseDefinitionId, String predefinedCaseInstanceId, String caseInstanceName, String businessKey,
-            String executionId, String tenantId, Map<String, Object> inParametersMap) {
+            String executionId, String tenantId, Map<String, Object> inParametersMap, Map<String, Object> transientVariablesMap) {
 
         CaseInstanceBuilder caseInstanceBuilder = cmmnEngineConfiguration.getCmmnRuntimeService().createCaseInstanceBuilder();
         caseInstanceBuilder.caseDefinitionId(caseDefinitionId);
@@ -76,6 +76,10 @@ public String startCaseInstance(String caseDefinitionId, String predefinedCaseIn
             caseInstanceBuilder.variable(target, inParametersMap.get(target));
         }
 
+        if (transientVariablesMap != null && !transientVariablesMap.isEmpty()) {
+            caseInstanceBuilder.transientVariables(transientVariablesMap);
+        }
+
         if (businessKey != null) {
             caseInstanceBuilder.businessKey(businessKey);
         }
diff --git a/modules/flowable-cmmn-engine-configurator/src/main/java/org/flowable/cmmn/engine/configurator/impl/process/DefaultProcessInstanceService.java b/modules/flowable-cmmn-engine-configurator/src/main/java/org/flowable/cmmn/engine/configurator/impl/process/DefaultProcessInstanceService.java
index a2e6f3fb44b..f84e21cc00f 100644
--- a/modules/flowable-cmmn-engine-configurator/src/main/java/org/flowable/cmmn/engine/configurator/impl/process/DefaultProcessInstanceService.java
+++ b/modules/flowable-cmmn-engine-configurator/src/main/java/org/flowable/cmmn/engine/configurator/impl/process/DefaultProcessInstanceService.java
@@ -60,16 +60,16 @@ public String generateNewProcessInstanceId() {
 
     @Override
     public String startProcessInstance(String processDefinitionId, String predefinedProcessInstanceId, String stageInstanceId,
-            String tenantId, Map<String, Object> inParametersMap, String businessKey,
+            String tenantId, Map<String, Object> inParametersMap, Map<String, Object> transientVariablesMap, String businessKey,
             Map<String, Object> variableFormVariables, FormInfo variableFormInfo, String variableFormOutcome) {
 
         return startProcessInstance(processDefinitionId, predefinedProcessInstanceId, null, stageInstanceId, tenantId,
-                inParametersMap, businessKey, variableFormVariables, variableFormInfo, variableFormOutcome);
+                inParametersMap, transientVariablesMap, businessKey, variableFormVariables, variableFormInfo, variableFormOutcome);
     }
 
     @Override
     public String startProcessInstance(String processDefinitionId, String predefinedProcessInstanceId, String planItemInstanceId, String stageInstanceId,
-            String tenantId, Map<String, Object> inParametersMap, String businessKey,
+            String tenantId, Map<String, Object> inParametersMap, Map<String, Object> transientVariablesMap, String businessKey,
             Map<String, Object> variableFormVariables, FormInfo variableFormInfo, String variableFormOutcome) {
 
         ProcessInstanceBuilder processInstanceBuilder = processEngineConfiguration.getRuntimeService().createProcessInstanceBuilder();
@@ -91,6 +91,10 @@ public String startProcessInstance(String processDefinitionId, String predefined
             processInstanceBuilder.variable(target, inParametersMap.get(target));
         }
 
+        if (transientVariablesMap != null && !transientVariablesMap.isEmpty()) {
+            processInstanceBuilder.transientVariables(transientVariablesMap);
+        }
+
         if (businessKey != null) {
             processInstanceBuilder.businessKey(businessKey);
         }
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/java/org/flowable/cmmn/test/CaseTaskTest.java b/modules/flowable-cmmn-engine-configurator/src/test/java/org/flowable/cmmn/test/CaseTaskTest.java
index 0829cb8c595..e7ed1452b8f 100644
--- a/modules/flowable-cmmn-engine-configurator/src/test/java/org/flowable/cmmn/test/CaseTaskTest.java
+++ b/modules/flowable-cmmn-engine-configurator/src/test/java/org/flowable/cmmn/test/CaseTaskTest.java
@@ -19,6 +19,7 @@
 
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -1603,4 +1604,90 @@ public void testParentProcessInstanceIdQuery() {
         }
     }
 
+    @Test
+    @CmmnDeployment
+    public void testCaseTaskInheritVariables() {
+        Deployment deployment = processEngineRepositoryService.createDeployment()
+                .addClasspathResource("org/flowable/cmmn/test/caseTaskInheritVariablesProcess.bpmn20.xml")
+                .deploy();
+
+        try {
+            ObjectNode jsonVariable = processEngineConfiguration.getObjectMapper().createObjectNode();
+            jsonVariable.put("field", "value");
+
+            Map<String, Object> variables = new HashMap<>();
+            variables.put("parentVar1", "hello");
+            variables.put("parentVar2", "world");
+            variables.put("parentVarJson", jsonVariable);
+            ProcessInstance processInstance = processEngineRuntimeService.createProcessInstanceBuilder()
+                    .processDefinitionKey("inheritVariablesProcess")
+                    .variables(variables)
+                    .transientVariables(Collections.singletonMap("parentTransientVar", "temp"))
+                    .start();
+
+            Execution caseTaskExecution = processEngineRuntimeService.createExecutionQuery()
+                    .onlyChildExecutions()
+                    .processInstanceId(processInstance.getId())
+                    .activityId("caseServiceTask")
+                    .singleResult();
+            assertThat(caseTaskExecution).isNotNull();
+
+            CaseInstance childCaseInstance = cmmnRuntimeService.createCaseInstanceQuery()
+                    .caseInstanceCallbackId(caseTaskExecution.getId())
+                    .caseInstanceCallbackType(CallbackTypes.EXECUTION_CHILD_CASE)
+                    .singleResult();
+            assertThat(childCaseInstance).isNotNull();
+
+            // All parent process variables are inherited into the child case instance (like a call activity)
+            assertThat(cmmnRuntimeService.getVariable(childCaseInstance.getId(), "parentVar1")).isEqualTo("hello");
+
+            // JSON variables are inherited (deep copied, consistent with in parameter handling)
+            JsonNode childJson = (JsonNode) cmmnRuntimeService.getVariable(childCaseInstance.getId(), "parentVarJson");
+            assertThat(childJson.path("field").asString()).isEqualTo("value");
+
+            // An explicit in parameter takes precedence over the inherited variable
+            assertThat(cmmnRuntimeService.getVariable(childCaseInstance.getId(), "parentVar2")).isEqualTo("overridden");
+
+            // Transient variables are inherited as transient: available while the child starts (the child task
+            // name resolves the ${parentTransientVar} expression) but not persisted on the child.
+            assertThat(cmmnTaskService.createTaskQuery().caseInstanceId(childCaseInstance.getId()).singleResult().getName()).isEqualTo("temp");
+            assertThat(cmmnRuntimeService.getVariable(childCaseInstance.getId(), "parentTransientVar")).isNull();
+
+        } finally {
+            processEngineRepositoryService.deleteDeployment(deployment.getId(), true);
+        }
+    }
+
+    @Test
+    @CmmnDeployment(resources = "org/flowable/cmmn/test/caseTaskInheritVariablesDisabledChildCase.cmmn")
+    public void testCaseTaskInheritVariablesDisabled() {
+        Deployment deployment = processEngineRepositoryService.createDeployment()
+                .addClasspathResource("org/flowable/cmmn/test/caseTaskInheritVariablesDisabledProcess.bpmn20.xml")
+                .deploy();
+
+        try {
+            ProcessInstance processInstance = processEngineRuntimeService.startProcessInstanceByKey(
+                    "inheritVariablesDisabledProcess", Collections.<String, Object>singletonMap("parentVar1", "hello"));
+
+            Execution caseTaskExecution = processEngineRuntimeService.createExecutionQuery()
+                    .onlyChildExecutions()
+                    .processInstanceId(processInstance.getId())
+                    .activityId("caseServiceTask")
+                    .singleResult();
+            assertThat(caseTaskExecution).isNotNull();
+
+            CaseInstance childCaseInstance = cmmnRuntimeService.createCaseInstanceQuery()
+                    .caseInstanceCallbackId(caseTaskExecution.getId())
+                    .caseInstanceCallbackType(CallbackTypes.EXECUTION_CHILD_CASE)
+                    .singleResult();
+            assertThat(childCaseInstance).isNotNull();
+
+            // Without inheritVariables, parent variables are not copied into the child case
+            assertThat(cmmnRuntimeService.getVariable(childCaseInstance.getId(), "parentVar1")).isNull();
+
+        } finally {
+            processEngineRepositoryService.deleteDeployment(deployment.getId(), true);
+        }
+    }
+
 }
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/java/org/flowable/cmmn/test/ProcessTaskTest.java b/modules/flowable-cmmn-engine-configurator/src/test/java/org/flowable/cmmn/test/ProcessTaskTest.java
index aa6f07e8267..73a0db1c63e 100644
--- a/modules/flowable-cmmn-engine-configurator/src/test/java/org/flowable/cmmn/test/ProcessTaskTest.java
+++ b/modules/flowable-cmmn-engine-configurator/src/test/java/org/flowable/cmmn/test/ProcessTaskTest.java
@@ -1015,6 +1015,72 @@ public void testIOParameterCombinations() {
                 .hasSize(4 + 4); // 4 from in mapping, 4 from task complete
     }
 
+    @Test
+    @CmmnDeployment
+    @org.flowable.engine.test.Deployment(resources = "org/flowable/cmmn/test/inheritVariablesChildProcess.bpmn20.xml")
+    public void testProcessTaskInheritVariables() {
+        ObjectNode jsonVariable = cmmnEngineConfiguration.getObjectMapper().createObjectNode();
+        jsonVariable.put("field", "value");
+
+        CaseInstance caseInstance = cmmnRuntimeService.createCaseInstanceBuilder()
+                .caseDefinitionKey("myCase")
+                .variable("caseVariableA", "hello")
+                .variable("caseVariableB", "world")
+                .variable("caseVariableC", 42)
+                .variable("caseVariableJson", jsonVariable)
+                .transientVariable("caseTransientVariable", "temp")
+                .transientVariable("collisionVar", "fromTransient")
+                .start();
+
+        PlanItemInstance processTaskPlanItemInstance = cmmnRuntimeService.createPlanItemInstanceQuery()
+                .caseInstanceId(caseInstance.getId())
+                .planItemDefinitionType(PlanItemDefinitionType.PROCESS_TASK)
+                .singleResult();
+        String processInstanceId = processTaskPlanItemInstance.getReferenceId();
+        ProcessInstance processInstance = processEngineRuntimeService.createProcessInstanceQuery().processInstanceId(processInstanceId).singleResult();
+        assertThat(processInstance).isNotNull();
+
+        // All case variables are inherited into the child process instance (like a BPMN call activity)
+        assertThat(processEngineRuntimeService.getVariable(processInstanceId, "caseVariableA")).isEqualTo("hello");
+        assertThat(processEngineRuntimeService.getVariable(processInstanceId, "caseVariableC")).isEqualTo(42);
+
+        // JSON variables are inherited (deep copied, consistent with in parameter handling)
+        JsonNode childJson = (JsonNode) processEngineRuntimeService.getVariable(processInstanceId, "caseVariableJson");
+        assertThat(childJson.path("field").asString()).isEqualTo("value");
+
+        // An explicit in parameter takes precedence over the inherited variable
+        assertThat(processEngineRuntimeService.getVariable(processInstanceId, "caseVariableB")).isEqualTo("overridden");
+
+        // Transient variables are inherited as transient: available while the child starts (the child task
+        // name resolves the ${caseTransientVariable} expression) but not persisted on the child.
+        assertThat(processEngineTaskService.createTaskQuery().processInstanceId(processInstanceId).singleResult().getName()).isEqualTo("temp");
+        assertThat(processEngineRuntimeService.getVariable(processInstanceId, "caseTransientVariable")).isNull();
+
+        // An explicit in parameter targeting the same name as an inherited transient variable wins on the
+        // persisted child: the inherited value goes to the (non-persisted) transient channel, so once the
+        // transient state is gone only the explicit in parameter's persistent value remains.
+        assertThat(processEngineRuntimeService.getVariable(processInstanceId, "collisionVar")).isEqualTo("fromInParam");
+    }
+
+    @Test
+    @CmmnDeployment
+    @org.flowable.engine.test.Deployment(resources = "org/flowable/cmmn/test/inheritVariablesDisabledChildProcess.bpmn20.xml")
+    public void testProcessTaskInheritVariablesDisabled() {
+        CaseInstance caseInstance = cmmnRuntimeService.createCaseInstanceBuilder()
+                .caseDefinitionKey("myCase")
+                .variable("caseVariableA", "hello")
+                .start();
+
+        PlanItemInstance processTaskPlanItemInstance = cmmnRuntimeService.createPlanItemInstanceQuery()
+                .caseInstanceId(caseInstance.getId())
+                .planItemDefinitionType(PlanItemDefinitionType.PROCESS_TASK)
+                .singleResult();
+        String processInstanceId = processTaskPlanItemInstance.getReferenceId();
+
+        // Without inheritVariables, parent variables are not copied into the child process
+        assertThat(processEngineRuntimeService.getVariable(processInstanceId, "caseVariableA")).isNull();
+    }
+
     @Test
     @CmmnDeployment
     public void testProcessTaskWithSkipExpressions() {
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/CaseTaskTest.testCaseTaskInheritVariables.cmmn b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/CaseTaskTest.testCaseTaskInheritVariables.cmmn
new file mode 100644
index 00000000000..990fadf1c96
--- /dev/null
+++ b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/CaseTaskTest.testCaseTaskInheritVariables.cmmn
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/CMMN/20151109/MODEL"
+             xmlns:dc="http://www.omg.org/spec/CMMN/20151109/DC"
+             xmlns:di="http://www.omg.org/spec/CMMN/20151109/DI"
+             xmlns:cmmndi="http://www.omg.org/spec/CMMN/20151109/CMMNDI"
+             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             targetNamespace="http://flowable.org/cmmn">
+
+    <case id="childCase">
+        <casePlanModel id="myPlanModel" name="My CasePlanModel">
+            <planItem id="planItem1" name="${parentTransientVar}" definitionRef="theTask" />
+            <humanTask id="theTask" name="${parentTransientVar}" />
+        </casePlanModel>
+    </case>
+
+</definitions>
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/ProcessTaskTest.testProcessTaskInheritVariables.cmmn b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/ProcessTaskTest.testProcessTaskInheritVariables.cmmn
new file mode 100644
index 00000000000..0e498eb8abe
--- /dev/null
+++ b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/ProcessTaskTest.testProcessTaskInheritVariables.cmmn
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/CMMN/20151109/MODEL"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:flowable="http://flowable.org/cmmn"
+    targetNamespace="http://flowable.org/cmmn">
+
+    <case id="myCase">
+        <casePlanModel id="myPlanModel" name="My CasePlanModel">
+            <planItem id="planItem1" name="The Process" definitionRef="theProcess" />
+            <processTask id="theProcess" isBlocking="true" flowable:inheritVariables="true">
+                <extensionElements>
+                    <flowable:in sourceExpression="${'overridden'}" target="caseVariableB" />
+                    <flowable:in sourceExpression="${'fromInParam'}" target="collisionVar" />
+                </extensionElements>
+                <processRefExpression><![CDATA[inheritVariablesChildProcess]]></processRefExpression>
+            </processTask>
+        </casePlanModel>
+    </case>
+
+</definitions>
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/ProcessTaskTest.testProcessTaskInheritVariablesDisabled.cmmn b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/ProcessTaskTest.testProcessTaskInheritVariablesDisabled.cmmn
new file mode 100644
index 00000000000..6a5c68fe917
--- /dev/null
+++ b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/ProcessTaskTest.testProcessTaskInheritVariablesDisabled.cmmn
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/CMMN/20151109/MODEL"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:flowable="http://flowable.org/cmmn"
+    targetNamespace="http://flowable.org/cmmn">
+
+    <case id="myCase">
+        <casePlanModel id="myPlanModel" name="My CasePlanModel">
+            <planItem id="planItem1" name="The Process" definitionRef="theProcess" />
+            <processTask id="theProcess" isBlocking="true">
+                <processRefExpression><![CDATA[inheritVariablesDisabledChildProcess]]></processRefExpression>
+            </processTask>
+        </casePlanModel>
+    </case>
+
+</definitions>
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/caseTaskInheritVariablesDisabledChildCase.cmmn b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/caseTaskInheritVariablesDisabledChildCase.cmmn
new file mode 100644
index 00000000000..3eaa074cd0f
--- /dev/null
+++ b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/caseTaskInheritVariablesDisabledChildCase.cmmn
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/CMMN/20151109/MODEL"
+             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             targetNamespace="http://flowable.org/cmmn">
+
+    <case id="disabledChildCase">
+        <casePlanModel id="myPlanModel" name="My CasePlanModel">
+            <planItem id="planItem1" name="Child Task" definitionRef="theTask" />
+            <humanTask id="theTask" name="Child Task" />
+        </casePlanModel>
+    </case>
+
+</definitions>
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/caseTaskInheritVariablesDisabledProcess.bpmn20.xml b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/caseTaskInheritVariablesDisabledProcess.bpmn20.xml
new file mode 100644
index 00000000000..854b413cbc5
--- /dev/null
+++ b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/caseTaskInheritVariablesDisabledProcess.bpmn20.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
+             xmlns:flowable="http://flowable.org/bpmn"
+             targetNamespace="http://flowable.org/bpmn">
+
+    <process id="inheritVariablesDisabledProcess">
+
+        <startEvent id="theStart" />
+
+        <sequenceFlow id="flow1" sourceRef="theStart" targetRef="caseServiceTask" />
+
+        <serviceTask id="caseServiceTask" flowable:type="case" flowable:caseDefinitionKey="disabledChildCase" />
+
+        <sequenceFlow id="flow2" sourceRef="caseServiceTask" targetRef="theEnd" />
+
+        <endEvent id="theEnd" />
+
+    </process>
+
+</definitions>
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/caseTaskInheritVariablesProcess.bpmn20.xml b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/caseTaskInheritVariablesProcess.bpmn20.xml
new file mode 100644
index 00000000000..25b4997dc23
--- /dev/null
+++ b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/caseTaskInheritVariablesProcess.bpmn20.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
+             xmlns:flowable="http://flowable.org/bpmn"
+             targetNamespace="http://flowable.org/bpmn">
+
+    <process id="inheritVariablesProcess">
+
+        <startEvent id="theStart" />
+
+        <sequenceFlow id="flow1" sourceRef="theStart" targetRef="caseServiceTask" />
+
+        <serviceTask id="caseServiceTask" flowable:type="case" flowable:caseDefinitionKey="childCase" flowable:inheritVariables="true">
+            <extensionElements>
+                <flowable:in sourceExpression="${'overridden'}" target="parentVar2" />
+            </extensionElements>
+        </serviceTask>
+
+        <sequenceFlow id="flow2" sourceRef="caseServiceTask" targetRef="theEnd" />
+
+        <endEvent id="theEnd" />
+
+    </process>
+
+</definitions>
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/inheritVariablesChildProcess.bpmn20.xml b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/inheritVariablesChildProcess.bpmn20.xml
new file mode 100644
index 00000000000..afe25e504a1
--- /dev/null
+++ b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/inheritVariablesChildProcess.bpmn20.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
+             xmlns:flowable="http://flowable.org/bpmn"
+             targetNamespace="http://flowable.org/bpmn">
+
+    <process id="inheritVariablesChildProcess">
+        <startEvent id="theStart" />
+        <sequenceFlow id="flow1" sourceRef="theStart" targetRef="theTask" />
+        <userTask id="theTask" name="${caseTransientVariable}" />
+        <sequenceFlow id="flow2" sourceRef="theTask" targetRef="theEnd" />
+        <endEvent id="theEnd" />
+    </process>
+
+</definitions>
diff --git a/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/inheritVariablesDisabledChildProcess.bpmn20.xml b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/inheritVariablesDisabledChildProcess.bpmn20.xml
new file mode 100644
index 00000000000..d465f4ee954
--- /dev/null
+++ b/modules/flowable-cmmn-engine-configurator/src/test/resources/org/flowable/cmmn/test/inheritVariablesDisabledChildProcess.bpmn20.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
+             xmlns:flowable="http://flowable.org/bpmn"
+             targetNamespace="http://flowable.org/bpmn">
+
+    <process id="inheritVariablesDisabledChildProcess">
+        <startEvent id="theStart" />
+        <sequenceFlow id="flow1" sourceRef="theStart" targetRef="theTask" />
+        <userTask id="theTask" name="Child Task" />
+        <sequenceFlow id="flow2" sourceRef="theTask" targetRef="theEnd" />
+        <endEvent id="theEnd" />
+    </process>
+
+</definitions>
diff --git a/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/CaseTaskActivityBehavior.java b/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/CaseTaskActivityBehavior.java
index f62dbd9eb36..ff7e1ce354f 100644
--- a/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/CaseTaskActivityBehavior.java
+++ b/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/CaseTaskActivityBehavior.java
@@ -57,7 +57,8 @@ public class CaseTaskActivityBehavior extends ChildTaskActivityBehavior implemen
     protected CaseTask caseTask;
 
     public CaseTaskActivityBehavior(Expression caseRefExpression, CaseTask caseTask) {
-        super(caseTask.isBlocking(), caseTask.getBlockingExpression(), caseTask.getInParameters(), caseTask.getOutParameters());
+        super(caseTask.isBlocking(), caseTask.getBlockingExpression(), caseTask.getInParameters(), caseTask.getOutParameters(),
+                caseTask.isInheritVariables());
         this.caseRefExpression = caseRefExpression;
         this.caseRef = caseTask.getCaseRef();
         this.fallbackToDefaultTenant = caseTask.getFallbackToDefaultTenant();
@@ -95,7 +96,8 @@ public void execute(CommandContext commandContext, PlanItemInstanceEntity planIt
         }
 
         Map<String, Object> finalVariableMap = new HashMap<>();
-        handleInParameters(planItemInstanceEntity, cmmnEngineConfiguration, finalVariableMap, cmmnEngineConfiguration.getExpressionManager());
+        Map<String, Object> transientVariablesMap = new HashMap<>();
+        handleInParameters(planItemInstanceEntity, cmmnEngineConfiguration, finalVariableMap, transientVariablesMap, cmmnEngineConfiguration.getExpressionManager());
 
         // Needed for the form field handler later
         Map<String, Object> variablesFromFormSubmission = null;
@@ -122,6 +124,9 @@ public void execute(CommandContext commandContext, PlanItemInstanceEntity planIt
 
         caseInstanceBuilder.businessKey(getBusinessKey(cmmnEngineConfiguration, planItemInstanceEntity, caseTask));
         caseInstanceBuilder.variables(finalVariableMap);
+        if (!transientVariablesMap.isEmpty()) {
+            caseInstanceBuilder.transientVariables(transientVariablesMap);
+        }
 
         if (sameDeployment) {
             caseInstanceBuilder.caseDefinitionParentDeploymentId(
diff --git a/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/ChildTaskActivityBehavior.java b/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/ChildTaskActivityBehavior.java
index 866bc0edd00..1efe012c4cf 100644
--- a/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/ChildTaskActivityBehavior.java
+++ b/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/ChildTaskActivityBehavior.java
@@ -31,6 +31,7 @@
 import org.flowable.common.engine.api.delegate.Expression;
 import org.flowable.common.engine.impl.el.ExpressionManager;
 import org.flowable.common.engine.impl.interceptor.CommandContext;
+import org.flowable.common.engine.impl.util.JsonUtil;
 import org.flowable.form.api.FormInfo;
 
 /**
@@ -43,6 +44,7 @@ public abstract class ChildTaskActivityBehavior extends CoreCmmnTriggerableActiv
     protected String isBlockingExpression;
     protected List<IOParameter> inParameters;
     protected List<IOParameter> outParameters;
+    protected boolean inheritVariables;
 
     public ChildTaskActivityBehavior(boolean isBlocking, String isBlockingExpression) {
         this.isBlocking = isBlocking;
@@ -50,9 +52,15 @@ public ChildTaskActivityBehavior(boolean isBlocking, String isBlockingExpression
     }
 
     public ChildTaskActivityBehavior(boolean isBlocking, String isBlockingExpression, List<IOParameter> inParameters, List<IOParameter> outParameters) {
+        this(isBlocking, isBlockingExpression, inParameters, outParameters, false);
+    }
+
+    public ChildTaskActivityBehavior(boolean isBlocking, String isBlockingExpression, List<IOParameter> inParameters, List<IOParameter> outParameters,
+            boolean inheritVariables) {
         this(isBlocking, isBlockingExpression);
         this.inParameters = inParameters;
         this.outParameters = outParameters;
+        this.inheritVariables = inheritVariables;
     }
 
     @Override
@@ -81,7 +89,24 @@ public void trigger(CommandContext commandContext, PlanItemInstanceEntity planIt
 
     protected void handleInParameters(PlanItemInstanceEntity planItemInstanceEntity,
                                       CmmnEngineConfiguration cmmnEngineConfiguration, Map<String, Object> inParametersMap,
-                                      ExpressionManager expressionManager) {
+                                      Map<String, Object> transientVariablesMap, ExpressionManager expressionManager) {
+
+        if (inheritVariables) {
+            // Inherit all variables from the parent. Explicit in parameters are
+            // applied afterwards, so they take precedence over the inherited persistent variables.
+            // Transient variables are kept transient in the child so they are not persisted
+            // JSON variables are deep copied so the parent and child don't share the same instance
+            Map<String, Object> transientVariables = planItemInstanceEntity.getTransientVariables();
+            for (Map.Entry<String, Object> entry : planItemInstanceEntity.getVariables().entrySet()) {
+                String variableName = entry.getKey();
+                Object variableValue = JsonUtil.deepCopyIfJson(entry.getValue());
+                if (transientVariables.containsKey(variableName)) {
+                    transientVariablesMap.put(variableName, variableValue);
+                } else {
+                    inParametersMap.put(variableName, variableValue);
+                }
+            }
+        }
 
         IOParameterUtil.processInParameters(inParameters, planItemInstanceEntity, inParametersMap, expressionManager);
     }
diff --git a/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/ProcessTaskActivityBehavior.java b/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/ProcessTaskActivityBehavior.java
index c47331e67fa..dd021545b14 100644
--- a/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/ProcessTaskActivityBehavior.java
+++ b/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/behavior/impl/ProcessTaskActivityBehavior.java
@@ -57,7 +57,8 @@ public class ProcessTaskActivityBehavior extends ChildTaskActivityBehavior imple
     protected ProcessTask processTask;
 
     public ProcessTaskActivityBehavior(Process process, Expression processRefExpression, ProcessTask processTask) {
-        super(processTask.isBlocking(), processTask.getBlockingExpression(), processTask.getInParameters(), processTask.getOutParameters());
+        super(processTask.isBlocking(), processTask.getBlockingExpression(), processTask.getInParameters(), processTask.getOutParameters(),
+                processTask.isInheritVariables());
         this.process = process;
         this.processRefExpression = processRefExpression;
         this.processRef = processTask.getProcessRef();
@@ -87,7 +88,8 @@ public void execute(CommandContext commandContext, PlanItemInstanceEntity planIt
         }
 
         Map<String, Object> inParametersMap = new HashMap<>();
-        handleInParameters(planItemInstanceEntity, cmmnEngineConfiguration, inParametersMap, cmmnEngineConfiguration.getExpressionManager());
+        Map<String, Object> transientVariablesMap = new HashMap<>();
+        handleInParameters(planItemInstanceEntity, cmmnEngineConfiguration, inParametersMap, transientVariablesMap, cmmnEngineConfiguration.getExpressionManager());
 
         FormInfo variableFormInfo = null;
         Map<String, Object> variableFormVariables = null;
@@ -135,7 +137,7 @@ public void execute(CommandContext commandContext, PlanItemInstanceEntity planIt
 
             try {
                 processInstanceService.startProcessInstance(processDefinitionId, processInstanceId, planItemInstanceEntity.getId(), planItemInstanceEntity.getStageInstanceId(),
-                        planItemInstanceEntity.getTenantId(), inParametersMap, businessKey, variableFormVariables, variableFormInfo, variableFormOutcome);
+                        planItemInstanceEntity.getTenantId(), inParametersMap, transientVariablesMap, businessKey, variableFormVariables, variableFormInfo, variableFormOutcome);
             } catch (BusinessError businessError) {
                 // An uncaught BusinessError from the child BPMN process propagates as a fault on this plan item.
                 // Clean up the orphaned child process instance (consistent with BPMN ErrorPropagation.executeCatch
@@ -149,7 +151,7 @@ public void execute(CommandContext commandContext, PlanItemInstanceEntity planIt
 
         } else {
             processInstanceService.startProcessInstance(processDefinitionId, processInstanceId, planItemInstanceEntity.getStageInstanceId(),
-                    planItemInstanceEntity.getTenantId(), inParametersMap, businessKey, variableFormVariables, variableFormInfo, variableFormOutcome);
+                    planItemInstanceEntity.getTenantId(), inParametersMap, transientVariablesMap, businessKey, variableFormVariables, variableFormInfo, variableFormOutcome);
         }
 
         if (!blocking) {
diff --git a/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/process/ProcessInstanceService.java b/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/process/ProcessInstanceService.java
index e12ea8b06a1..36dfd0a2190 100644
--- a/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/process/ProcessInstanceService.java
+++ b/modules/flowable-cmmn-engine/src/main/java/org/flowable/cmmn/engine/impl/process/ProcessInstanceService.java
@@ -35,14 +35,14 @@ public interface ProcessInstanceService {
      * Starts a process instance without a reference to a plan item instance (i.e. non-blocking behavior).
      */
     String startProcessInstance(String processDefinitionId, String predefinedProcessInstanceId, String stageInstanceId,
-            String tenantId, Map<String, Object> inParametersMap, String businessKey,
+            String tenantId, Map<String, Object> inParametersMap, Map<String, Object> transientVariablesMap, String businessKey,
             Map<String, Object> variableFormVariables, FormInfo variableFormInfo, String variableFormOutcome);
 
     /**
      * Starts a process instance with a reference to a plan item instance (i.e. blocking behavior).
      */
     String startProcessInstance(String processDefinitionId, String predefinedProcessInstanceId, String planItemInstanceId, String stageInstanceId,
-            String tenantId, Map<String, Object> inParametersMap, String businessKey,
+            String tenantId, Map<String, Object> inParametersMap, Map<String, Object> transientVariablesMap, String businessKey,
             Map<String, Object> variableFormVariables, FormInfo variableFormInfo, String variableFormOutcome);
 
     /**
diff --git a/modules/flowable-cmmn-engine/src/test/java/org/flowable/cmmn/test/runtime/CaseTaskTest.java b/modules/flowable-cmmn-engine/src/test/java/org/flowable/cmmn/test/runtime/CaseTaskTest.java
index 8ff291a8626..a2669fa121c 100644
--- a/modules/flowable-cmmn-engine/src/test/java/org/flowable/cmmn/test/runtime/CaseTaskTest.java
+++ b/modules/flowable-cmmn-engine/src/test/java/org/flowable/cmmn/test/runtime/CaseTaskTest.java
@@ -1236,6 +1236,66 @@ public void testWithInheritBusinessKeyButWithoutBusinessKey() {
         cmmnRuntimeService.triggerPlanItemInstance(planItemInstance.getId());
     }
 
+    @Test
+    @CmmnDeployment(resources = {
+            "org/flowable/cmmn/test/runtime/CaseTaskTest.testCaseTaskInheritVariables.cmmn",
+            "org/flowable/cmmn/test/runtime/CaseTaskTest.inheritVariablesChildCase.cmmn"
+    })
+    public void testCaseTaskInheritVariables() {
+        ObjectNode jsonVariable = cmmnEngineConfiguration.getObjectMapper().createObjectNode();
+        jsonVariable.put("field", "value");
+
+        CaseInstance caseInstance = cmmnRuntimeService.createCaseInstanceBuilder()
+                .caseDefinitionKey("myCase")
+                .variable("caseVariableA", "hello")
+                .variable("caseVariableB", "world")
+                .variable("caseVariableC", 42)
+                .variable("caseVariableJson", jsonVariable)
+                .transientVariable("caseTransientVariable", "temp")
+                .start();
+
+        CaseInstance subCase = cmmnRuntimeService.createCaseInstanceQuery()
+                .caseDefinitionKey("inheritVariablesChildCase")
+                .singleResult();
+        assertThat(subCase).isNotNull();
+
+        // All parent case variables are inherited into the child case instance (like a BPMN call activity)
+        assertThat(cmmnRuntimeService.getVariable(subCase.getId(), "caseVariableA")).isEqualTo("hello");
+        assertThat(cmmnRuntimeService.getVariable(subCase.getId(), "caseVariableC")).isEqualTo(42);
+
+        // JSON variables are inherited (deep copied, consistent with in parameter handling)
+        JsonNode childJson = (JsonNode) cmmnRuntimeService.getVariable(subCase.getId(), "caseVariableJson");
+        assertThat(childJson.path("field").asString()).isEqualTo("value");
+
+        // An explicit in parameter takes precedence over the inherited variable
+        assertThat(cmmnRuntimeService.getVariable(subCase.getId(), "caseVariableB")).isEqualTo("overridden");
+
+        // Transient variables are inherited as transient: available while the child starts (the child task
+        // name resolves the ${caseTransientVariable} expression) but not persisted on the child.
+        assertThat(cmmnTaskService.createTaskQuery().caseInstanceId(subCase.getId()).singleResult().getName()).isEqualTo("temp");
+        assertThat(cmmnRuntimeService.getVariable(subCase.getId(), "caseTransientVariable")).isNull();
+    }
+
+    @Test
+    @CmmnDeployment(resources = {
+            "org/flowable/cmmn/test/runtime/CaseTaskTest.testCaseTaskInheritVariablesDisabled.cmmn",
+            "org/flowable/cmmn/test/runtime/oneTaskCase.cmmn"
+    })
+    public void testCaseTaskInheritVariablesDisabled() {
+        cmmnRuntimeService.createCaseInstanceBuilder()
+                .caseDefinitionKey("myCase")
+                .variable("caseVariableA", "hello")
+                .start();
+
+        CaseInstance subCase = cmmnRuntimeService.createCaseInstanceQuery()
+                .caseDefinitionKey("oneTaskCase")
+                .singleResult();
+        assertThat(subCase).isNotNull();
+
+        // Without inheritVariables, parent variables are not copied into the child case
+        assertThat(cmmnRuntimeService.getVariable(subCase.getId(), "caseVariableA")).isNull();
+    }
+
     @Test
     @CmmnDeployment
     public void testIdVariableName() {
diff --git a/modules/flowable-cmmn-engine/src/test/resources/org/flowable/cmmn/test/runtime/CaseTaskTest.inheritVariablesChildCase.cmmn b/modules/flowable-cmmn-engine/src/test/resources/org/flowable/cmmn/test/runtime/CaseTaskTest.inheritVariablesChildCase.cmmn
new file mode 100644
index 00000000000..b96d04a3728
--- /dev/null
+++ b/modules/flowable-cmmn-engine/src/test/resources/org/flowable/cmmn/test/runtime/CaseTaskTest.inheritVariablesChildCase.cmmn
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/CMMN/20151109/MODEL"
+             xmlns:flowable="http://flowable.org/cmmn"
+             targetNamespace="http://flowable.org/cmmn">
+
+    <case id="inheritVariablesChildCase" name="inheritVariablesChildCase">
+        <casePlanModel id="myPlanModel" name="My CasePlanModel">
+            <planItem id="planItem1" name="${caseTransientVariable}" definitionRef="theTask" />
+            <humanTask id="theTask" name="${caseTransientVariable}" isBlocking="true" />
+        </casePlanModel>
+    </case>
+
+</definitions>
diff --git a/modules/flowable-cmmn-engine/src/test/resources/org/flowable/cmmn/test/runtime/CaseTaskTest.testCaseTaskInheritVariables.cmmn b/modules/flowable-cmmn-engine/src/test/resources/org/flowable/cmmn/test/runtime/CaseTaskTest.testCaseTaskInheritVariables.cmmn
new file mode 100644
index 00000000000..492f03f9660
--- /dev/null
+++ b/modules/flowable-cmmn-engine/src/test/resources/org/flowable/cmmn/test/runtime/CaseTaskTest.testCaseTaskInheritVariables.cmmn
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/CMMN/20151109/MODEL"
+             xmlns:flowable="http://flowable.org/cmmn"
+             targetNamespace="http://flowable.org/cmmn">
+
+    <case id="myCase">
+        <casePlanModel id="myPlanModel" name="My CasePlanModel">
+            <planItem id="planItem1" name="The Case" definitionRef="theCase"/>
+            <caseTask id="theCase" caseRef="inheritVariablesChildCase" isBlocking="true" flowable:inheritVariables="true">
+                <extensionElements>
+                    <flowable:in sourceExpression="${'overridden'}" target="caseVariableB"/>
+                </extensionElements>
+            </caseTask>
+        </casePlanModel>
+    </case>
+</definitions>
diff --git a/modules/flowable-cmmn-engine/src/test/resources/org/flowable/cmmn/test/runtime/CaseTaskTest.testCaseTaskInheritVariablesDisabled.cmmn b/modules/flowable-cmmn-engine/src/test/resources/org/flowable/cmmn/test/runtime/CaseTaskTest.testCaseTaskInheritVariablesDisabled.cmmn
new file mode 100644
index 00000000000..f9bbb4c11ef
--- /dev/null
+++ b/modules/flowable-cmmn-engine/src/test/resources/org/flowable/cmmn/test/runtime/CaseTaskTest.testCaseTaskInheritVariablesDisabled.cmmn
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<definitions xmlns="http://www.omg.org/spec/CMMN/20151109/MODEL"
+             xmlns:flowable="http://flowable.org/cmmn"
+             targetNamespace="http://flowable.org/cmmn">
+
+    <case id="myCase">
+        <casePlanModel id="myPlanModel" name="My CasePlanModel">
+            <planItem id="planItem1" name="The Case" definitionRef="theCase"/>
+            <caseTask id="theCase" caseRef="oneTaskCase" isBlocking="true"/>
+        </casePlanModel>
+    </case>
+</definitions>
diff --git a/modules/flowable-cmmn-model/src/main/java/org/flowable/cmmn/model/ChildTask.java b/modules/flowable-cmmn-model/src/main/java/org/flowable/cmmn/model/ChildTask.java
index 59f705488ba..e7017b1c0d5 100644
--- a/modules/flowable-cmmn-model/src/main/java/org/flowable/cmmn/model/ChildTask.java
+++ b/modules/flowable-cmmn-model/src/main/java/org/flowable/cmmn/model/ChildTask.java
@@ -22,6 +22,7 @@ public class ChildTask extends Task implements HasInParameters, HasOutParameters
 
     protected String businessKey;
     protected boolean inheritBusinessKey;
+    protected boolean inheritVariables;
     protected List<IOParameter> inParameters = new ArrayList<>();
     protected List<IOParameter> outParameters = new ArrayList<>();
 
@@ -41,6 +42,14 @@ public void setInheritBusinessKey(boolean inheritBusinessKey) {
         this.inheritBusinessKey = inheritBusinessKey;
     }
 
+    public boolean isInheritVariables() {
+        return inheritVariables;
+    }
+
+    public void setInheritVariables(boolean inheritVariables) {
+        this.inheritVariables = inheritVariables;
+    }
+
     @Override
     public List<IOParameter> getInParameters() {
         return inParameters;
diff --git a/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/behavior/CallActivityBehavior.java b/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/behavior/CallActivityBehavior.java
index 0a1f1710911..6d848fe4338 100644
--- a/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/behavior/CallActivityBehavior.java
+++ b/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/behavior/CallActivityBehavior.java
@@ -36,6 +36,7 @@
 import org.flowable.common.engine.api.scope.ScopeTypes;
 import org.flowable.common.engine.impl.el.ExpressionManager;
 import org.flowable.common.engine.impl.interceptor.CommandContext;
+import org.flowable.common.engine.impl.util.JsonUtil;
 import org.flowable.engine.DynamicBpmnConstants;
 import org.flowable.engine.ProcessEngineConfiguration;
 import org.flowable.engine.delegate.DelegateExecution;
@@ -160,11 +161,13 @@ public void execute(DelegateExecution execution) {
                 // The executionVariables contain all variables, including the transient variables.
                 // Hence why that map is iterated and the transient variables are split off
                 String variableName = entry.getKey();
+                // JSON variables are deep copied so the parent and child don't share the same instance
+                Object variableValue = JsonUtil.deepCopyIfJson(entry.getValue());
                 if (transientVariables.containsKey(variableName)) {
-                    instanceBeforeContext.getTransientVariables().put(variableName, entry.getValue());
+                    instanceBeforeContext.getTransientVariables().put(variableName, variableValue);
 
                 } else {
-                    instanceBeforeContext.getVariables().put(variableName, entry.getValue());
+                    instanceBeforeContext.getVariables().put(variableName, variableValue);
 
                 }
             }
diff --git a/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/behavior/CaseTaskActivityBehavior.java b/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/behavior/CaseTaskActivityBehavior.java
index 6e4ff39a68e..ec77c2ada54 100644
--- a/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/behavior/CaseTaskActivityBehavior.java
+++ b/modules/flowable-engine/src/main/java/org/flowable/engine/impl/bpmn/behavior/CaseTaskActivityBehavior.java
@@ -26,6 +26,7 @@
 import org.flowable.common.engine.api.variable.VariableContainer;
 import org.flowable.common.engine.impl.el.ExpressionManager;
 import org.flowable.common.engine.impl.interceptor.CommandContext;
+import org.flowable.common.engine.impl.util.JsonUtil;
 import org.flowable.engine.delegate.DelegateExecution;
 import org.flowable.engine.impl.bpmn.helper.ErrorPropagation;
 import org.flowable.engine.impl.cfg.ProcessEngineConfigurationImpl;
@@ -86,6 +87,24 @@ public void execute(DelegateExecution execution) {
         }
         
         Map<String, Object> inParameters = new HashMap<>();
+        Map<String, Object> transientVariables = new HashMap<>();
+
+        if (caseServiceTask.isInheritVariables()) {
+            // Inherit all variables from the parent. Explicit in parameters are
+            // applied afterwards, so they take precedence over the inherited persistent variables.
+            // Transient variables are kept transient in the child so they are not persisted
+            // JSON variables are deep copied so the parent and child don't share the same instance
+            Map<String, Object> executionTransientVariables = execution.getTransientVariables();
+            for (Map.Entry<String, Object> entry : execution.getVariables().entrySet()) {
+                String variableName = entry.getKey();
+                Object variableValue = JsonUtil.deepCopyIfJson(entry.getValue());
+                if (executionTransientVariables.containsKey(variableName)) {
+                    transientVariables.put(variableName, variableValue);
+                } else {
+                    inParameters.put(variableName, variableValue);
+                }
+            }
+        }
 
         // copy process variables
         IOParameterUtil.processInParameters(caseServiceTask.getInParameters(), execution, inParameters::put, inParameters::put, expressionManager);
@@ -120,7 +139,7 @@ public void execute(DelegateExecution execution) {
 
         try {
             caseInstanceService.startCaseInstance(caseDefinitionId, caseInstanceId,
-                    caseInstanceName, businessKey, execution.getId(), execution.getTenantId(), inParameters);
+                    caseInstanceName, businessKey, execution.getId(), execution.getTenantId(), inParameters, transientVariables);
         } catch (BusinessError businessError) {
             // An uncaught BusinessError from the child CMMN case propagates as a BPMN error.
             // Clean up the orphaned child case instance, then propagate.
diff --git a/modules/flowable-engine/src/main/java/org/flowable/engine/impl/cmmn/CaseInstanceService.java b/modules/flowable-engine/src/main/java/org/flowable/engine/impl/cmmn/CaseInstanceService.java
index 9d64a11957b..9ac191a8149 100644
--- a/modules/flowable-engine/src/main/java/org/flowable/engine/impl/cmmn/CaseInstanceService.java
+++ b/modules/flowable-engine/src/main/java/org/flowable/engine/impl/cmmn/CaseInstanceService.java
@@ -29,7 +29,7 @@ public interface CaseInstanceService {
     String generateNewCaseInstanceId();
 
     String startCaseInstance(String caseDefinitionId, String predefinedCaseInstanceId, String caseInstanceName, String businessKey,
-            String executionId, String tenantId, Map<String, Object> inParametersMap);
+            String executionId, String tenantId, Map<String, Object> inParametersMap, Map<String, Object> transientVariablesMap);
 
     void handleSignalEvent(EventSubscriptionEntity eventSubscription, Map<String, Object> variables);