CVE-2026-90997
Keycloak: Replay protection bypass leads to unauthorized access via database driver semantics mismatch
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-294 |
| Vendor | keycloak |
| Product | keycloak |
| Published | Sep 17, 2026 |
| Last Updated | Sep 17, 2026 |
Stay Ahead of the Next One
Get instant alerts for keycloak keycloak
Be the first to know when new high vulnerabilities affecting keycloak keycloak are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Keycloak / Keycloak
26.7.0 < 26.7.4