{"id":"CVE-2026-82465","summary":"pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest","details":"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.","modified":"2026-09-02T03:30:20.497598010Z","published":"2026-08-29T16:35:28.321Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-345"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82465.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82465.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82465"},{"type":"ADVISORY","url":"https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/pac4j-saml-before-6.5.6-session-destruction-via-unsigned-logoutrequest"},{"type":"FIX","url":"https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e"},{"type":"PACKAGE","url":"https://github.com/pac4j/pac4j"},{"type":"ARTICLE","url":"https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.java"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/pac4j/pac4j","events":[{"introduced":"0"},{"fixed":"0ce4586f0526cb94d1e2bb6623c416db9b4dc2a3"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"6.5.6"}]}}],"versions":["pac4j-parent-6.5.5","pac4j-parent-6.5.4","pac4j-parent-6.5.3","pac4j-parent-6.5.2","pac4j-parent-6.5.1","pac4j-parent-6.5.0","pac4j-parent-6.4.1","pac4j-parent-6.4.0","pac4j-parent-6.4.0-RC1","pac4j-parent-6.3.2","pac4j-parent-6.3.1","pac4j-parent-6.3.0","pac4j-parent-6.2.2","pac4j-parent-6.2.1","pac4j-parent-6.2.0","pac4j-parent-6.1.3","pac4j-parent-6.1.2","pac4j-parent-6.1.1","pac4j-parent-6.1.0","pac4j-parent-6.0.6","pac4j-parent-6.0.5","6.0.4.1","pac4j-parent-6.0.4","pac4j-parent-6.0.3","pac4j-parent-6.0.2","pac4j-parent-6.0.1","pac4j-parent-6.0.0","pac4j-parent-6.0.0-RC10","pac4j-parent-6.0.0-RC9","pac4j-parent-6.0.0-RC8","pac4j-parent-6.0.0-RC7","pac4j-parent-6.0.0-RC6","pac4j-parent-6.0.0-RC5","pac4j-parent-6.0.0-RC4","pac4j-parent-6.0.0-RC3","pac4j-parent-6.0.0-RC2","pac4j-parent-6.0.0-RC1","pac4j-parent-5.7.0","pac4j-parent-5.6.1","pac4j-parent-5.6.0","pac4j-parent-5.5.0","pac4j-parent-5.4.6","pac4j-parent-5.4.5","pac4j-parent-5.4.4","pac4j-parent-5.4.3","pac4j-parent-5.4.2","pac4j-parent-5.4.0","pac4j-parent-5.3.1","pac4j-parent-5.3.0","pac4j-parent-5.2.1","pac4j-parent-5.2.0","pac4j-5.1.5","pac4j-5.1.4","pac4j-5.1.3","pac4j-5.1.2","pac4j-5.1.1","pac4j-5.1.0","pac4j-5.0.1","pac4j-5.0.0","pac4j-5.0.0-RC2","pac4j-5.0.0-RC1","pac4j-4.1.0","pac4j-4.0.3","pac4j-4.0.2","pac4j-4.0.1","pac4j-4.0.0","pac4j-4.0.0-RC3","pac4j-4.0.0-RC2","pac4j-4.0.0-RC1","pac4j-3.4.0","pac4j-3.3.0","pac4j-3.2.0","pac4j-3.1.0","pac4j-3.0.1","pac4j-3.0.0","pac4j-3.0.0-RC2","pac4j-3.0.0-RC1","pac4j-2.1.0","pac4j-2.0.0","pac4j-2.0.0-RC2","pac4j-2.0.0-RC1","pac4j-1.9.3","pac4j-1.9.2","pac4j-1.9.1","pac4j-1.9.0","pac4j-1.8.3","pac4j-1.8.2","pac4j-1.8.1","pac4j-1.8.0","pac4j-1.8.0-RC1","pac4j-1.7.0","pac4j-1.6.0","pac4j-1.6.0-RC1","pac4j-1.5.1","pac4j-1.5.0","pac4j-1.4.1","pac4j-1.4.0","scribe-up-1.3.1","scribe-up-1.3.0","scribe-up-1.1.0","scribe-up-1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82465.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}