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CVE-2025-12390

Good to know:

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Date: October 28, 2025

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.

Severity Score

Related Resources (4)

https://access.redhat.com/security/cve/CVE-2025-12390
https://bugzilla.redhat.com/show_bug.cgi?id=2406793
https://nvd.nist.gov/vuln/detail/CVE-2025-12390
https://www.mend.io/vulnerability-database/CVE-2025-12390

Severity Score

Weakness Type (CWE)

Session Fixation

CWE-384

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

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