{"id":"CVE-2026-109082","title":"A flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-services component of Keycloak","summary":"A flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-services component of Keycloak. This component handles advanced authentication flows where a client initiates a login on behalf o…","severity":"medium","cvss":6.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","cwe":["CWE-287"],"published":"2026-10-12","updated":"2026-10-12","sourceUpdated":"2026-10-12T08:17:19.787","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109082","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-109082","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2549478","label":"secalert@redhat.com"}],"tags":["nvd"],"ingestedAt":"2026-10-12T14:50:34.094Z","slug":"CVE-2026-109082","body":"## Overview\n\nA flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-services component of Keycloak. This component handles advanced authentication flows where a client initiates a login on behalf of a user. The issue occurs because Keycloak fails to verify that a client is authorized to use the CIBA flow, allowing public clients to bypass security requirements. An attacker could use this flaw to trick a user into approving a login request, eventually gaining full access to the users account without needing a client secret.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":37.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}