CVE-2026-97846: Red Hat Build Of Keycloak

Medium severity, CVSS 6.8. EPSS: 0.1% chance of exploitation in the next 30 days.

Keycloak provides a feature called mTLS holder-of-key binding which ensures that a token can only be used by the client that originally requested it by binding it to their digital certificate. A flaw was discovered where the new Standard Token Exchange V2 feature does not check for this certificate. This allows an attacker with stolen client credentials to obtain a standard, unrestricted token that bypasses these security protections.

Affected products

• Red Hat Red Hat Build Of Keycloak
• Red Hat Red Hat Single Sign-On 7

Published 2026-09-25. Last modified 2026-09-25.