CVE-2025-12390

EUVD-2025-36502
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6 MEDIUM
LOCAL
HIGH
LOW
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
redhatCNA
6 MEDIUM
LOCAL
HIGH
LOW
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 3%
Common Weakness Enumeration
References
https://access.redhat.com/errata/RHSA-2025:21370
https://access.redhat.com/errata/RHSA-2025:21371
https://access.redhat.com/errata/RHSA-2025:22088
https://access.redhat.com/errata/RHSA-2025:22089
https://access.redhat.com/security/cve/CVE-2025-12390
https://bugzilla.redhat.com/show_bug.cgi?id=2406793
https://github.com/keycloak/keycloak/issues/43853