SecuriTricks - CVE-2025-12390

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.

Product(s) Impacted

Vendor	Product	Versions
Keycloak	Keycloak	*

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-384

Session Fixation

Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	keycloak	keycloak	/	/	/	/	/	/	/	/

References

https://access.redhat.com/security/cve/CVE-2025-12390

https://bugzilla.redhat.com/show_bug.cgi?id=2406793

CVSS Score

6.0 / 10

CVSS Data - 3.1

Attack Vector: LOCAL
Attack Complexity: HIGH
Privileges Required: LOW
Scope: UNCHANGED
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: NONE

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

View Vector String

Timeline

Published: Oct. 28, 2025, 2:15 p.m.
Last Modified: Oct. 28, 2025, 2:15 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

secalert@redhat.com

CVE-2025-12390