# CVE-2026-82465

## Summary

- **CVE ID:** CVE-2026-82465
- **Severity:** MEDIUM
- **CVSS Score:** 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)
- **CWE:** CWE-345
- **Published:** Aug 29, 2026
- **Last Modified:** Aug 31, 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.

## Affected Products

- pac4j — pac4j (0)

## References

- [CNA](https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e)
- [CNA](https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html)
- [CNA](https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.java)
- [CNA](https://github.com/pac4j/pac4j)
- [CNA](https://www.vulncheck.com/advisories/pac4j-saml-before-6.5.6-session-destruction-via-unsigned-logoutrequest)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._