{"id":"CVE-2026-9798","title":"A flaw was found in Keycloak, an open-source identity and access management solution","summary":"A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initi…","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"],"vendor":"redhat","product":"build_of_keycloak","affected":["build_of_keycloak"],"published":"2026-05-28","updated":"2026-08-05","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-9798","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:50846","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:50847","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:50848","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:50849","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-9798","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2482470","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00348,"epssPercentile":0.28364,"ingestedAt":"2026-08-06T06:56:50.725Z","slug":"CVE-2026-9798","body":"## Overview\n\nA flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication (CIBA) flow to bypass this brute-force protection. This allows continued authentication attempts and token issuance even when the account should be locked, potentially enabling further unauthorized access attempts.\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":[]}