CVE-2026-90997 Security feature bypass in Keycloak
Attackers can bypass replay protection in stateless Keycloak deployments with MySQL/MariaDB to replay security artifacts and gain unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90997?
CVE-2026-90997 is a high-severity vulnerability in Keycloak, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in Keycloak. When deployed in stateless mode with MySQL or MariaDB, a mismatch in row-count semantics between the database driver and Keycloak's application logic allows an attacker to bypass replay protection. This vulnerability enables an attacker who intercepts single-use security artifacts, such as JWT client assertions, DPoP proofs, or one-time password (TOTP) codes, to replay them. Successful exploitation grants unauthorized access to the token endpoint or login flow.
Weakness: CWE-294
Which versions are affected by CVE-2026-90997?
How do I fix CVE-2026-90997?
No fix has been published for CVE-2026-90997 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-90997 being exploited?
There is no known exploitation of CVE-2026-90997 in the wild and no public exploit code.