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    CVE-2026-90997

    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.

    Published:Sep 16, 2026
    Last Modified:Sep 22, 2026
    EPS:Sep 17, 2026
    EPSS Score:0.00396
    CVSS Score:7.4

    Affected Products

    Vendor
    Keycloak
    Product
    Keycloak
    Vendor
    Redhat
    Product
    Build Keycloak

    Exploits

    No exploit reference

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High