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CVE-2025-12390

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

Published: Oct 28, 2025Updated: Dec 19, 2025 Sources: CVE List NVD GHSACWE-384
NVD MITRE
6.0CVSSMEDIUM
EPSS Score
0.1%
Top 98.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:LAC:HPR:LUI:RS:UC:HI:HA:N
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-384

Affected Products

keycloakKeycloak
On-prem
Security Products / identity-access-mgmt
Red Hat build of Keycloak 26.2Red Hat
On-prem
Operating Systems / linux-distro
Red Hat build of Keycloak 26.2.11Red Hat
On-prem
Operating Systems / linux-distro
Red Hat build of Keycloak 26.4Red Hat
On-premWeb App
Web & CMS Plugins
Red Hat build of Keycloak 26.4.4Red Hat
On-prem
Operating Systems / linux-distro
keycloakoss-projectSecurity Productsaka keycloak-nodejs-auth-utils
red hatcommercialUSOperating Systemsaka red hat
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Defense Evasion
Initial Access
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2025:21370
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:21371
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:22088
access.redhat.com
and 12 more references View all →

Timeline

Published
Oct 28, 2025
Last Updated
Dec 19, 2025

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