CVE-2025-12653

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.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/579372	Broken Link
https://hackerone.com/reports/3370245	Permissions Required

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:gitlab:gitlab:::::community:::*
	cpe:2.3:a:gitlab:gitlab:::::enterprise:::*
	cpe:2.3:a:gitlab:gitlab:::::community:::*
	cpe:2.3:a:gitlab:gitlab:::::enterprise:::*
	cpe:2.3:a:gitlab:gitlab:18.6.0::::community:::
	cpe:2.3:a:gitlab:gitlab:18.6.0::::enterprise:::

History

10 Dec 2025, 23:15

Type	Values Removed	Values Added
References		() https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/ -

02 Dec 2025, 20:36

Type	Values Removed	Values Added
References	~~() https://gitlab.com/gitlab-org/gitlab/-/issues/579372 -~~	() https://gitlab.com/gitlab-org/gitlab/-/issues/579372 - Broken Link
References	~~() https://hackerone.com/reports/3370245 -~~	() https://hackerone.com/reports/3370245 - Permissions Required
First Time		Gitlab Gitlab gitlab
CPE		cpe:2.3:a:gitlab:gitlab:::::enterprise:::* cpe:2.3:a:gitlab:gitlab:18.6.0::::community::: cpe:2.3:a:gitlab:gitlab:18.6.0::::enterprise::: cpe:2.3:a:gitlab:gitlab:::::community:::*

26 Nov 2025, 20:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-11-26 20:15

Updated : 2025-12-10 23:15

NVD link : CVE-2025-12653

Mitre link : CVE-2025-12653

CVE.ORG link : CVE-2025-12653

JSON object : View

Products Affected

gitlab

gitlab

CWE

CWE-290

Authentication Bypass by Spoofing

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