CVE-2026-90997
Keycloak-services: keycloak: replay protection bypass leads to unauthorized access via database driver semantics mismatch
- State
- Published
- Severity
- 7.4 High
- Published
- Sep 17, 2026
- Updated
- Sep 25, 2026
- Reserved
- Sep 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.4 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | redhat |
Weaknesses
- CWE-294 Authentication Bypass by Capture-replay
Affected Products
| Product | Versions |
|---|---|
KeycloakKeycloak |
|
Red Hat Build of KeycloakRed Hat | |
Red Hat Build of KeycloakRed Hat |
References
- https://access.redhat.com/security/cve/CVE-2026-90997vdb-entry
- RHBZ#2533141issue-tracking
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