{"id":"CVE-2026-16103","title":"A flaw was found in the keycloak-services component of Keycloak","summary":"A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication (CIBA) initiation handl…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N","cwe":["CWE-305","CWE-841"],"vendor":"redhat","product":"build_of_keycloak","affected":["build_of_keycloak"],"published":"2026-07-17","updated":"2026-08-31","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-16103","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-16103","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2501736","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00345,"epssPercentile":0.27973,"ingestedAt":"2026-08-31T13:08:32.482Z","slug":"CVE-2026-16103","body":"## Overview\n\nA flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication (CIBA) initiation handler but were omitted from the token redemption handler. This allows an attacker with valid client credentials to obtain access and refresh tokens for a user account that has been locked due to brute-force protection, provided the authentication request was started before the lockout occurred and was approved by the user.\n\n## Affected\n\n- `build_of_keycloak`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}