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    CVE-2025-12390

    A flaw was found in Keycloak. In Keycloak where a user can accidentally get access to another user's session if both use the same device and browser. This happens because Keycloak sometimes reuses session identifiers and doesn’t clean up properly during logout when browser cookies are missing. As a result, one user may receive tokens that belong to another user.

    Published:Oct 28, 2025
    Last Modified:Apr 15, 2026
    EPS:Oct 28, 2025
    EPSS Score:0.00015
    CVSS Score:6

    Affected Products

    Vendor
    Redhat
    Product
    Build Keycloak

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-384 Session Fixation

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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