Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-1609US | high8.1 | — | ||
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 dis… | ||||
references
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/CVE-2026-1609ADVISORY
- https://bugzilla.redhat.com/show_bug.cgi?id=2435257ADVISORY
- https://github.com/keycloak/keycloak/issues/46144REPORT
- https://github.com/keycloak/keycloak/releases/tag/26.5.3ARTICLE
- https://nvd.nist.gov/vuln/detail/CVE-2026-1609WEB
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.jsonADVISORY
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