Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-5rxp-2rhr-qwqv. This link is maintained to preserve external references.

Original Description A session fixation issue was discovered in the SAML adapters provided by Keycloak. The session ID and JSESSIONID cookie are not changed at login time, even when the turnOffChangeSessionIdOnLogin option is configured. This flaw allows an attacker who hijacks the current session before authentication to trigger session fixation.