{"id":"CVE-2026-117691","aliases":["EUVD-2026-117441","GHSA-c85j-3hq2-q6wj"],"status":"published","title":"Keycloak-services: keycloak-services: saml redirect binding signature bypass via percent-encoded parameter names","description":"A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak. The issue occurs because the server processes percent-encoded parameter names (like %53AMLResponse) while the signature verification logic only checks literal parameter names. An attacker can use this discrepancy to provide a crafted, unsigned SAML message that the server processes instead of a legitimately signed one, leading to full account takeover of federated users.","severity":{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00282,"percentile":0.2099,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-347"],"published":"2026-11-05T13:27:23Z","modified":"2026-11-07T15:39:27Z","exploits":[{"source":"pocgithub","id":"foxcornlab/keycloak-saml-scanner","title":"foxcornlab/keycloak-saml-scanner","date":"2026-11-07","url":"https://github.com/foxcornlab/keycloak-saml-scanner"}],"products":[{"vendor":"red hat","product":"red hat build of keycloak 26.6"},{"vendor":"red hat","product":"red hat build of keycloak 26.6.9"},{"vendor":"red hat","product":"red hat single sign-on 7"}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:96039","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:96040","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-117691","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2561977","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117691"},{"url":"https://github.com/advisories/GHSA-c85j-3hq2-q6wj"}],"sources":{"cve":[{"id":"CVE-2026-117691","title":"Keycloak-services: keycloak-services: saml redirect binding signature bypass via percent-encoded parameter names","description":"A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak. The issue occurs because the server processes percent-encoded parameter names (like %53AMLResponse) while the signature verification logic only checks literal parameter names. An attacker can use this discrepancy to provide a crafted, unsigned SAML message that the server processes instead of a legitimately signed one, leading to full account takeover of federated users.","status":"published","published":"2026-11-05T13:27:23.748Z","modified":"2026-11-07T15:39:27.366Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"cna"}],"cwes":["CWE-347"],"updated_at":"2026-11-07T16:34:41.67647Z"}],"euvd":[{"id":"EUVD-2026-117441","description":"A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak. The issue occurs because the server processes percent-encoded parameter names (like %53AMLResponse) while the signature verification logic only checks literal parameter names. An attacker can use this discrepancy to provide a crafted, unsigned SAML message that the server processes instead of a legitimately signed one, leading to full account takeover of federated users.","status":"published","published":"2026-11-05T13:27:23Z","modified":"2026-11-07T15:39:27Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-07T17:10:00.031807Z"}],"ghsa":[{"id":"GHSA-c85j-3hq2-q6wj","title":"A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak. The issue occurs...","description":"A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak. The issue occurs because the server processes percent-encoded parameter names (like %53AMLResponse) while the signature verification logic only checks literal parameter names. An attacker can use this discrepancy to provide a crafted, unsigned SAML message that the server processes instead of a legitimately signed one, leading to full account takeover of federated users.","status":"published","published":"2026-11-05T15:32:36Z","modified":"2026-11-07T18:32:40Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"cwes":["CWE-347"],"updated_at":"2026-11-07T18:38:39.596198Z"}],"nvd":[{"id":"CVE-2026-117691","description":"A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak. The issue occurs because the server processes percent-encoded parameter names (like %53AMLResponse) while the signature verification logic only checks literal parameter names. An attacker can use this discrepancy to provide a crafted, unsigned SAML message that the server processes instead of a legitimately signed one, leading to full account takeover of federated users.","status":"published","published":"2026-11-05T14:17:01.32Z","modified":"2026-11-07T16:16:39.99Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical","assessor":"secondary"}],"cwes":["CWE-347"],"updated_at":"2026-11-07T18:06:08.223117Z"}]}}