Bug 2406793 (CVE-2025-12390) - CVE-2025-12390 org.keycloak.protocol.oidc.endpoints.LogoutEndpoint: Offline Session takeover due to reused Authentication Session ID
Summary: CVE-2025-12390 org.keycloak.protocol.oidc.endpoints.LogoutEndpoint: Offline S...
Keywords:
Status: NEW
Alias: CVE-2025-12390
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-10-28 13:15 UTC by OSIDB Bzimport
Modified: 2025-10-28 13:20 UTC (History)
8 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2025-10-28 13:15:15 UTC 
There is a security issue 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.
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