CVE-2025-12653

Published: Nov 26, 2025Modified: Dec 10, 2025

6.5

Vector

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

Exploitability: 3.9 / Impact: 2.5

Source: cve@gitlab.com (Secondary)

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests.

Affected (6)

Products: Gitlab: Gitlab

Gitlab

1 product

Gitlab

Configuration A

6 vulnerable

Vulnerable Software	Affected Versions
Gitlab Gitlab	From 18.3.0 to 18.4.5
Gitlab Gitlab	From 18.5.0 to 18.5.3
Gitlab Gitlab	From 18.3.0 to 18.4.5
Gitlab Gitlab	From 18.5.0 to 18.5.3
Gitlab Gitlab	Version 18.6.0
Gitlab Gitlab	Version 18.6.0

Related CWEs

CWE-290

Authentication Bypass by Spoofing

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

References (3)

https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/

Source: cve@gitlab.com

https://gitlab.com/gitlab-org/gitlab/-/issues/579372

Source: cve@gitlab.com

Broken Link

https://hackerone.com/reports/3370245

Source: cve@gitlab.com

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Timeline

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