CVE-2026-82465
pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-345 |
| Vendor | pac4j |
| Product | pac4j |
| Published | Aug 29, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
pac4j / pac4j
0 < 6.5.6
References
github.com: https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e pac4j.org: https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html github.com: https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.java github.com: https://github.com/pac4j/pac4j vulncheck.com: https://www.vulncheck.com/advisories/pac4j-saml-before-6.5.6-session-destruction-via-unsigned-logoutrequest
Credits
Joshua Rogers (AISLE Research)