Vulnerability details
CVE-2026-90997
Keycloak Keycloak
Keycloak-services: keycloak: replay protection bypass leads to unauthorized access via database driver semantics mismatch
CVSS 3.1
7.4High
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.4High | 3.1 | CVEProject cvelistV5 (CNA) (redhat) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Keycloak | Keycloak | 26.7.0 ≤ v < 26.7.4 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://access.redhat.com/security/cve/CVE-2026-90997 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2533141 issue-trackingx_refsource_REDHAT
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Details
- Published
- 2026-09-17
- Last updated
- 2026-09-25
- State
- Published
- Assigner (CNA)
- redhat
Exploit prediction (EPSS)
0.39%
Probability of exploitation in 30 days
34%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-294Authentication Bypass by Capture-replay