Security Advisory
CVE-2025-12390
CVE vulnerability detail — eXtreme Datacenter Security Operations
Description
A flaw was found in Keycloak. In Keycloak where a user can accidentally get access to another users 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.