CVE-2026-90997

HighCVSS 7.4/10Last modified Sep 22, 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.

Metrics

CVSS 3.1 7.4/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-294

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Keycloak	Keycloak	>= 26.7.0, < 26.7.4
Red Hat	Red Hat Build of Keycloak	—
Red Hat	Red Hat Build of Keycloak	—

References

Timeline

Published: Sep 17, 2026
Last modified: Sep 22, 2026
NVD status: Awaiting Analysis

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