CVE-2025-12390A flaw was found in Keycloak.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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.
- CVSS
- 6.0 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-384
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Deferred
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
No affected products are listed yet.
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.