CVE-2026-54733

The Moodle integration for Microsoft 365/Entra ID (local_o365) is vulnerable prior to 4.5.6, 5.0.5, and 5.1.1. The Teams SSO endpoint sso_login.php base64-decodes a JWT payload and authenticates users based on the upn claim without verifying the JWT signature, enabling an unauthenticated attacker...