{"id":"CVE-2026-1609","title":"A flaw was found in Keycloak","summary":"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…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-284","CWE-284"],"vendor":"redhat","product":"build_of_keycloak","affected":["build_of_keycloak = 26.5.2"],"published":"2026-07-16","updated":"2026-08-09","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-1609","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-1609","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2435257","label":"secalert@redhat.com"},{"url":"https://github.com/keycloak/keycloak/issues/46144","label":"secalert@redhat.com"},{"url":"https://github.com/keycloak/keycloak/releases/tag/26.5.3","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-1609","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2435257","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"tags":["nvd"],"epss":0.00562,"epssPercentile":0.45269,"ingestedAt":"2026-08-09T15:33:36.193Z","slug":"CVE-2026-1609","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `build_of_keycloak = 26.5.2`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}