CVE-2025-12390
Keycloak vulnerable to session takeovers due to reuse of session identifiers
6.0
MEDIUM
CVSS 3.1
EPSS 0.13%
Description
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.
How to fix CVE-2025-12390
To remediate CVE-2025-12390, upgrade the affected package to a fixed version below.
- —upgrade to 26.0.0 or later
Is CVE-2025-12390 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 26.0.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N |