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Area

No response

Describe the bug

As part of the JAX-RS features each path element allows RFC-compliant matrix parameters, although Keycloak is not using them anywhere. They are basically ignored.

It would be good to not allow any matrix parameter to harden Keycloak until we actually make use of them.

Version

main

Regression

[ ] The issue is a regression

Expected behavior

Return a 400 response when there is a semicolon in the URL

Actual behavior

Matrix parameters are silently ignored.

How to Reproduce?

Use a semicolon in a URL

Anything else?

I'll prepare a PR