{
"id": "GHSA-r76c-m8xx-m685",
"aliases": [
"CVE-2026-82465"
],
"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.",
"affected": [],
"modified": "2026-08-29T18:31:31Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
}
],
"published": "2026-08-29T18:31:31Z",
"references": [
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82465",
"type": "ADVISORY"
},
{
"url": "https://github.com/pac4j/pac4j/commit/2270c3ff70e93cc43831e75702acd5135531237e",
"type": "WEB"
},
{
"url": "https://github.com/pac4j/pac4j",
"type": "WEB"
},
{
"url": "https://github.com/pac4j/pac4j/blob/pac4j-parent-6.5.5/pac4j-saml/src/main/java/org/pac4j/saml/logout/impl/SAML2LogoutValidator.java",
"type": "WEB"
},
{
"url": "https://www.pac4j.org/blog/security-advisory-pac4j-core-oidc-saml.html",
"type": "WEB"
},
{
"url": "https://www.vulncheck.com/advisories/pac4j-saml-before-6.5.6-session-destruction-via-unsigned-logoutrequest",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-345"
],
"severity": "MODERATE",
"github_reviewed": false,
"nvd_published_at": "2026-08-29T17:17:58Z",
"github_reviewed_at": null
}
}