CVE-2026-90997Keycloak-services: keycloak: replay protection bypass leads to unauthorized access via database driver semantics mismatch
Updated under an hour ago ()
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It affects Keycloak and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-294
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Keycloak Keycloak keycloak:keycloak (from the name) | from 26.7.0 before 26.7.4 | CNA record |
Red Hat Red Hat Build of Keycloak redhat:build_keycloak | Versions not stated | CNA record |
References
- https://access.redhat.com/security/cve/CVE-2026-90997vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2533141issue-tracking, x-refsource-redhat
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.