Print Bridge listens on TCP 631 on every interface and answers IPP, eSCL and a small web page. That is deliberate: it has to be reachable from phones on the same network. It is designed for a trusted local network and nothing more.

Anyone who can reach the port can print, scan, and read the list of printers. They cannot browse the PC: the server answers a fixed set of paths and serves static files only from its own web/ folder.

There is no TLS. Traffic on the local network is not encrypted, so a document in flight is readable by anyone who can already see your LAN traffic.

Do not port-forward 631, and do not run it on a network you do not control. Nothing here is written to survive a hostile caller.

On a shared or office network, start it with a code:

Start Print Bridge.bat --pin 4417

That requires the code on every print, scan and web request.

Open a GitHub issue for anything that is not directly exploitable.

For something sensitive, please use GitHub's private vulnerability reporting on this repository rather than a public issue, so it can be fixed before it is described.

Please include what you did, what happened, and the Windows and Python versions. A log from --debug-print helps.

The latest release only. This is a single-maintainer project.