Medium severity5.3NVD Advisory· Published Aug 29, 2026
CVE-2026-82465
CVE-2026-82465
Description
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.
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Patches
Vulnerability mechanics
References
4- github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.javanvd
- github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237envd
- www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.htmlnvd
- www.vulncheck.com/advisories/pac4j-saml-before-6.5.6-session-destruction-via-unsigned-logoutrequestnvd
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