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TI-2026-56859 Aliases CVE-2026-82465GHSA-r76c-m8xx-m685

pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest

Priority LOW 30CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00263 18th percentileScored 2026-11-07
Fix Fixed pac4j (pac4j): 6.5.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
pac4jpac4jbefore 6.5.66.5.6Patch availableCNA
  • pac4j Vendorpac4j Affected before 6.5.6 Fixed in 6.5.6 Patch available CNA

Remediation

  • Fix · CNA pac4j (pac4j) Fixed in 6.5.6

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    pac4j — pac4j Security Advisory for pac4j-core, pac4j-oidc and pac4j-saml

    5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2026-56857 pac4j-core before 6.5.6 Authorization Bypass via Reversed Profile Type CheckPriority MEDIUM 40
    • TI-2026-56855 pac4j-oidc before 6.5.6 Privilege Escalation via Unverified Keycloak Access TokenPriority LOW 37
    • TI-2026-56856 pac4j-oidc before 6.5.6 Authentication Bypass via Access Token SubstitutionPriority LOW 36
    Show all 5 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-82465
  2. 2026-10-03 Alias added: GHSA-r76c-m8xx-m685

References

Patch 1

Advisory 1

Other 2

  • TI-2026-23172 pac4j-jwt JwtAuthenticator Authentication Bypass CVSS 4.0CRITICAL 9.3
  • TI-2023-10883 Deserialization of untrusted data in InternalAttributeHandler in pac4j CVSS 4.0CRITICAL 9.2
  • TI-2026-29211 LDAP Injection in PAC4J CVSS 4.0HIGH 8.7
  • TI-2026-56857 pac4j-core before 6.5.6 Authorization Bypass via Reversed Profile Type Check CVSS 4.0HIGH 8.6
  • TI-2026-56855 pac4j-oidc before 6.5.6 Privilege Escalation via Unverified Keycloak Access Token CVSS 4.0HIGH 8.6
  • TI-2026-56856 pac4j-oidc before 6.5.6 Authentication Bypass via Access Token Substitution CVSS 4.0MEDIUM 6.9
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences