Red HatCVE-2026-90997
Red Hat Keycloak.: capture-replay
High7.4CVE-2026-90997 · Published Sep 17, 2026 · updated Sep 22, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Keycloak Product | >= 26.7.0, < 26.7.4 | 26.7.4 |
| Red Hat Build of Keycloak Product | all versions | No fix yet |
| all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-294
More Red Hat advisories
All Red Hat| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 17 | Red Hat libxml2: null pointer dereference | Medium5.5 | No fix yet |
| Sep 17 | Red Hat quarkus-websockets-next. This vulnerability: denial of service | High7.5 | No fix yet |
| Sep 17 | Red Hat SmallRye JWT: path traversal | Medium5.3 | No fix yet |
| Sep 17 | Red Hat bmctest: missing authentication | Medium5.3 | No fix yet |
| Sep 17 | Red Hat Satellite 6: improper authorization | Medium4.3 | No fix yet |
| Sep 17 | Redis community: out-of-bounds read | High7.1 | No fix yet |