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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History

Mon, 31 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 29 Aug 2026 16:45:00 +0000

Type Values Removed Values Added
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.
Title pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest
First Time appeared Pac4j
Pac4j pac4j
Weaknesses CWE-345
CPEs cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*
Vendors & Products Pac4j
Pac4j pac4j
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 6.9, 'vector': '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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-31T18:19:23.176Z

Reserved: 2026-08-29T14:11:01.638Z

Link: CVE-2026-82465

cve-icon Vulnrichment

Updated: 2026-08-31T18:16:56.283Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-29T17:17:58.773

Modified: 2026-09-10T19:54:25.810

Link: CVE-2026-82465

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-29T17:30:12Z

Weaknesses