{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "6.5.6"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0ce4586f0526cb94d1e2bb6623c416db9b4dc2a3"
            }
          ],
          "repo": "https://github.com/pac4j/pac4j",
          "type": "GIT"
        }
      ]
    }
  ],
  "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"
  },
  "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.",
  "id": "CVE-2026-82465",
  "modified": "2026-09-02T03:30:20.497598010Z",
  "published": "2026-08-29T16:35:28.321Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "pac4j-saml before 6.5.6 Session Destruction via Unsigned LogoutRequest"
}