CVE-2026-90997
High
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.
SeverityHigh
CVSS7.4
Exploit probability—
Product
Keycloak
PublishedSep 17, 2026
First seenSep 17, 2026
Weakness typeCWE-294CWE-294
How to fix
Update
- Keycloak Keycloak26.7.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Keycloak Keycloak | 26.7.0 ≤ v < 26.7.4 | 26.7.4 |
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