Vulnerability in Pac4j-SAML Affects Session Termination Process
CVE-2026-82465

6.9MEDIUM

Key Information:

Vendor

Pac4j

Status
Pac4j
Vendor
CVE Published:
29 August 2026

What is CVE-2026-82465?

The Pac4j-SAML library prior to version 6.5.6 lacks adequate validation for SAML LogoutRequest messages. Without the requirement for signature validation, an attacker can exploit this flaw by sending an unsigned LogoutRequest that utilizes a guessed NameID (such as an email address) to prematurely terminate a victim's SAML session. This vulnerability could lead to unauthorized session termination and compromise user authentication processes.

Affected Version(s)

pac4j 0 < 6.5.6

References

https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc4383...
patch
https://www.pac4j.org/blog/security-advisory-pac4j-core-o...
vendor-advisory
https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pa...
technical-description

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Joshua Rogers (AISLE Research)
.