CVE-2026-82465
pac4j-saml before 6.5.6 does not require signature validation of SAML LogoutRequest messages in SAML2LogoutValidator.validateLogoutRequest(). When an IdP sends no SessionIndex, a session can be destroyed based solely on the NameID, allowing an unauthenticated attacker to submit an unsigned LogoutRequest with a guessed identifier (e.g., an email address used as NameID) to terminate a victim's SAML session.
- Published Aug 29, 2026
- CVSS 6.9 medium
- 0.3% chance of exploitation in the next 30 days (EPSS)
- A fix is available