Medium 6.0Published Oct 28, 2025

CVE-2025-12390Org.keycloak.protocol.oidc.endpoints.logoutendpoint: offline session takeover due to reused authentication session id

Updated under an hour ago (Oct 28, 2026, 5:40 AM ET)

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It affects keycloak and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for keycloak

Exploited in the last 30 days

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, CNA)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: redhat
NVD analysis: Deferred
Record last updated: Jul 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Keycloak keycloak keycloak:keycloak (from the name)	before 26.0.0	CNA record
Red Hat Red Hat build of Keycloak 26.2 redhat:build_keycloak	from 26.2.11-1 not affected	CNA record

References

References

https://access.redhat.com/errata/RHSA-2025:21370	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2025:21371	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2025:22088	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2025:22089	vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2025-12390	vdb-entry, x-refsource-redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2406793	issue-tracking, x-refsource-redhat
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.