{"id":"CVE-2026-1609","summary":"Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users","details":"A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.","aliases":["BIT-keycloak-2026-1609"],"modified":"2026-08-26T01:11:56.058610744Z","published":"2026-07-16T00:26:10.772Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1609.json","unresolved_ranges":[{"extracted_events":[{"introduced":"26.5.0"},{"fixed":"26.5.3"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"redhat","cwe_ids":["CWE-284"]},"references":[{"type":"WEB","url":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html"},{"type":"WEB","url":"https://github.com/keycloak/keycloak/releases/tag/26.5.3"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-1609"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1609.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1609"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2435257"},{"type":"REPORT","url":"https://github.com/keycloak/keycloak/issues/46144"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/keycloak/keycloak","events":[{"introduced":"4c5b05789e16ec963e9477ce1f58118ca89c4d6e"},{"last_affected":"4c5b05789e16ec963e9477ce1f58118ca89c4d6e"}],"database_specific":{"extracted_events":[{"introduced":"26.5.2"},{"last_affected":"26.5.2"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:redhat:build_of_keycloak:26.5.2:*:*:*:*:*:*:*"}}],"versions":["26.5.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-1609.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}