Authorization bypass through user-controlled key in Keycloak - CVE-2026-4630
Published: September 10, 2026
Vulnerability identifier: #VU148953
CSH Severity: Low
CVSS v4: 7.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-4630
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose information and modify or delete data.
The vulnerability exists due to authorization bypass through a user-controlled key in the Authorization Services Protection API endpoint when handling requests that specify the UUID of a resource owned by another Resource Server in the same realm. A remote user can send GET, PUT, or DELETE requests using a known or obtained resource UUID to disclose information and modify or delete data.
Affected software
Keycloak
Red Hat build of Keycloak
Red Hat build of Keycloak
How to mitigate CVE-2026-4630
Install security update from vendor's website.
Keycloak - update to 26.6.2
Red Hat build of Keycloak - update to 26.4.12
Red Hat build of Keycloak - update to 26.4.12