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

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Main Vulnerability Database Vulnerabilities #VU118792

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

Published: November 26, 2025


Vulnerability identifier: #VU118792
CSH Severity: Medium
CVSS v4.0: 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/E:U/U:Green
CVE-ID: CVE-2025-12653
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: GitLab, Inc
Affected software:
Gitlab Community Edition
GitLab Enterprise Edition

Detailed vulnerability description

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. 


How to mitigate CVE-2025-12653

Install updates from vendor's website.

Sources