CVE-2025-12390 (GCVE-0-2025-12390)

Vulnerability from cvelistv5 – Published: 2025-10-28 13:23 – Updated: 2025-12-02 15:10
VLAI?
Summary
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.
Severity ?
6 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
CWE
Assigner
References
https://access.redhat.com/errata/RHSA-2025:21370 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:21371 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:22088 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:22089 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-12390 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2406793 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2.11-1 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.2::el9
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    Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2-12 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.2::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2-12 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.2::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2.11     cpe:/a:redhat:build_keycloak:26.2::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.4 Unaffected: 26.4.4-1 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.4::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.4 Unaffected: 26.4-3 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.4::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.4 Unaffected: 26.4-3 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.4::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.4.4     cpe:/a:redhat:build_keycloak:26.4::el9
 Create a notification for this product.
Credits
Red Hat would like to thank Simon Levermann (CTS EVENTIM Solutions GmbH) for reporting this issue.
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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