CVE-2026-82465
pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest
- State
- Published
- Severity
- 6.9 Medium
- Published
- Aug 29, 2026
- Updated
- Aug 31, 2026
- Reserved
- Aug 29, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-345 Insufficient Verification of Data Authenticity
Affected Products
| Product | Versions |
|---|---|
pac4jpac4j |
|
References
- Patch Commitpatch
- pac4j Security Advisory for pac4j-core, pac4j-oidc and pac4j-samlvendor-advisory
- https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.javatechnical-description
- https://github.com/pac4j/pac4jproduct
- VulnCheck Advisory: pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequestthird-party-advisory
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