CVE-2025-12390

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

28/10/2025

Last modified:

13/11/2025

Description

A flaw was found in Keycloak. In Keycloak where a user can accidentally get access to another user&#39;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.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 6.00 MEDIUM
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

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

Base Score 3.x

6.00

Severity 3.x

MEDIUM

CVE-2025-12390

Description

Impact

References to Advisories, Solutions, and Tools