CVE-2025-12390
Org.keycloak.protocol.oidc.endpoints.logoutendpoint: offline session takeover due to reused authentication session id
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.
INFO
Published Date :
Oct. 28, 2025, 2:15 p.m.
Last Modified :
Nov. 28, 2025, 4:15 a.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 53f830b8-0a3f-465b-8143-3b8a9948e749 | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Apply Keycloak updates promptly.
- Ensure proper session management configuration.
- Implement robust session cleanup routines.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-12390.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-12390 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-12390
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-12390 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-12390 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
Nov. 28, 2025
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2025:22088 Added Reference https://access.redhat.com/errata/RHSA-2025:22089 -
CVE Modified by [email protected]
Nov. 13, 2025
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2025:21370 Added Reference https://access.redhat.com/errata/RHSA-2025:21371 -
New CVE Received by [email protected]
Oct. 28, 2025
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N Added CWE CWE-384 Added Reference https://access.redhat.com/security/cve/CVE-2025-12390 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2406793