{"id":"CVE-2026-117691","title":"Keycloak-services: keycloak-services: saml redirect binding signature bypass via percent-encoded parameter names","summary":"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…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cvssSource":"cna","cwe":["CWE-347"],"vendor":"Red Hat","product":"keycloak-services","affected":["keycloak-services (all versions)","rhbk/keycloak-rhel9 (all versions)","keycloak-services"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-11-05T16:28:53.520705Z"},"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T16:29:19.689Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-117691","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-117691"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2561977","label":"RHBZ#2561977"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T22:38:31.353Z","slug":"CVE-2026-117691","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `keycloak-services (all versions)`\n- `rhbk/keycloak-rhel9 (all versions)`\n- `keycloak-services`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}