CVE-2026-97846 Keycloak-services: keycloak-services: standard token exchange v2 bypasses mtls holder-of-key binding
Attackers with stolen credentials can bypass mTLS holder-of-key binding in Keycloak's Standard Token Exchange V2 to obtain unrestricted tokens.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-97846?
CVE-2026-97846 is a medium-severity vulnerability in Red Hat Build of Keycloak, published on 25 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-97846?
How do I fix CVE-2026-97846?
No fix has been published for CVE-2026-97846 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-97846 being exploited?
There is no known exploitation of CVE-2026-97846 in the wild and no public exploit code.
Sources
Also known as GHSA-f7cv-8449-mr73.