Incorrect Implementation of Authentication Algorithm in Keycloak - CVE-2026-8922
Published: September 5, 2026
Vulnerability identifier: #VU146988
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-8922
CWE-ID: CWE-303
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to gain unauthorized access.
The vulnerability exists due to an incorrect implementation of an authentication algorithm in the OpenID Connect introspection feature when both realm-level and client-level notBefore revocation policies are configured. A remote user can submit a token that should have been revoked for introspection to gain unauthorized access.
Affected software
Keycloak
Red Hat build of Keycloak
Red Hat build of Keycloak
How to mitigate CVE-2026-8922
Install security update from vendor's website.
Keycloak - update to 26.6.3
Red Hat build of Keycloak - addressed in versions 26.4.13, 26.6.3
Red Hat build of Keycloak - addressed in versions 26.4.13, 26.6.3