GHSA-J8GJ-9RM5-4XHX Symfony's Cas2Handler Derives CAS service URL from Client Host Header → Cross-Service Ticket Replay

Cas2Handler builds this service parameter from Request::getSchemeAndHttpHost, which reflects the attacker-controlled HTTP Host header whenever Symfony's framework.trustedhosts setting is not configured the default. An attacker who controls any other application registered with the same CAS server...