{"id":"CVE-2026-117859","title":"Keycloak-services: keycloak-services: par single-use bypass via flow restart","summary":"A flaw was found in the Pushed Authorization Request PAR implementation of the keycloak-services component. The issue occurs when an authentication flow is restarted, which incorrectly clears the internal markers used to track PAR consum…","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-670"],"vendor":"Red Hat","product":"keycloak-services","affected":["keycloak-services (all versions)","rhbk/keycloak-rhel9 (all versions)","keycloak-services"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-29T15:30:08.711098Z"},"published":"2026-10-29","updated":"2026-10-29","sourceUpdated":"2026-10-29T17:20:26.217Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-117859","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-117859"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2561991","label":"RHBZ#2561991"}],"tags":["cve.org"],"epss":0.00193,"epssPercentile":0.09022,"ingestedAt":"2026-11-01T22:02:40.987Z","slug":"CVE-2026-117859","body":"## Overview\n\nA flaw was found in the Pushed Authorization Request PAR implementation of the keycloak-services component. The issue occurs when an authentication flow is restarted, which incorrectly clears the internal markers used to track PAR consumption while leaving the request active. This allows an attacker to reuse the same authorization request to obtain multiple access tokens, bypassing security requirements for single-use requests.\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":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}