Incorrect authorization in Keycloak - CVE-2026-1609
Published: September 10, 2026
Vulnerability identifier: #VU148918
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-1609
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to obtain authentication tokens.
The vulnerability exists due to improper authorization in the JWT Authorization Grant flow when requesting tokens for a disabled user. A remote user can use the JWT Authorization Grant flow to obtain authentication tokens.
Affected software
Keycloak
How to mitigate CVE-2026-1609
Install security update from vendor's website.
Keycloak - update to 26.5.3