Improper authentication in GitLab Enterprise Edition and Gitlab Community Edition - CVE-2025-12653

 

Improper authentication in GitLab Enterprise Edition and Gitlab Community Edition - CVE-2025-12653

Published: November 26, 2025


Vulnerability identifier: #VU118792
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-12653
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in account registration feature. A remote non-authenticated attacker can bypass authentication process and join any organization during registration by manipulating certain HTTP headers. 


Affected software

GitLab Enterprise Edition
Gitlab Community Edition

How to mitigate CVE-2025-12653

Install updates from vendor's website.

GitLab Enterprise Edition - addressed in versions 18.4.5, 18.5.3, 18.6.1
Gitlab Community Edition - addressed in versions 18.4.5, 18.5.3, 18.6.1

External References

Related Security Bulletins