{"id":"CVE-2026-82465","title":"pac4j-saml before 6.5.6 does not require signature validation of SAML LogoutRequest messages in SAML2LogoutValidator.validateLogoutRequest()","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, allow…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-345"],"published":"2026-08-29","updated":"2026-09-10","sourceUpdated":"2026-09-10T19:54:25.810","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-82465","references":[{"url":"https://github.com/pac4j/pac4j","label":"disclosure@vulncheck.com"},{"url":"https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.java","label":"disclosure@vulncheck.com"},{"url":"https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e","label":"disclosure@vulncheck.com"},{"url":"https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/pac4j-saml-before-6.5.6-session-destruction-via-unsigned-logoutrequest","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.0018,"epssPercentile":0.0783,"ingestedAt":"2026-08-30T12:52:23.686Z","slug":"CVE-2026-82465","body":"## Overview\n\npac4j-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}