CVE-2026-82465CWE-345

CVE-2026-82465

Medium · published August 29, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
17.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
6.9 · 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
EPSS
0.00263 · 17.2th percentile
Weakness
CWE-345 · Insufficient Verification of Data Authenticity
Published
2026-08-29T21:17Z
References (5)
https://github.com/pac4j/pac4j · [email protected]https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.java · [email protected]https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e · [email protected]https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html · [email protected]https://www.vulncheck.com/advisories/pac4j-saml-before-6.5.6-session-destruction-via-unsigned-logoutrequest · [email protected]
EPSS history
Timeline
  • 30 AUG 16:19Z
    EPSS moved — → 0%
    epss
  • 29 AUG 16:35Z
    pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest
    cvelistv5