CVE-2025-12390CWE-384

CVE-2025-12390

Medium · published October 28, 2025

CVSS v3.1
6.0
EPSS
0%
Percentile
3.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.0 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00141 · 3.1th percentile
Weakness
CWE-384 · Session Fixation
Published
2025-10-28T18:15Z
References (7)
https://access.redhat.com/errata/RHSA-2025:21370 · [email protected]https://access.redhat.com/errata/RHSA-2025:21371 · [email protected]https://access.redhat.com/errata/RHSA-2025:22088 · [email protected]https://access.redhat.com/errata/RHSA-2025:22089 · [email protected]https://access.redhat.com/security/cve/CVE-2025-12390 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2406793 · [email protected]https://github.com/keycloak/keycloak/issues/43853 · [email protected]
EPSS history
Timeline
  • 28 OCT 13:23Z
    Org.keycloak.protocol.oidc.endpoints.logoutendpoint: offline session takeover due to reused authentication session id
    cvelistv5