CVE-2025-12390

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.

Affected Software

VendorProductVersion RangeStatus
Keycloakkeycloak0 < 26.0.0affected
Red HatRed Hat build of Keycloak 26.226.2.11-1 < *unaffected
Red HatRed Hat build of Keycloak 26.226.2-12 < *unaffected
Red HatRed Hat build of Keycloak 26.226.2-12 < *unaffected
Red HatRed Hat build of Keycloak 26.426.4.4-1 < *unaffected
Red HatRed Hat build of Keycloak 26.426.4-3 < *unaffected
Red HatRed Hat build of Keycloak 26.426.4-3 < *unaffected

Weaknesses

  • CWE-384: Session Fixation

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References