Vulnerability in Gitlab
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.
EPSS: 0.003 (20.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Gitlab — versions 18.3, 18.5, 18.6.0
Weakness classification (CWE)
References
- cve@gitlab.com (vendor-advisory)
- cve@gitlab.com (issue-tracking, permissions-required, Broken Link)
- cve@gitlab.com (Permissions Required, technical-description, permissions-required, exploit)
Frequently asked questions
- What is CVE-2025-12653?
- CVE-2025-12653 is a medium-severity vulnerability in Gitlab, classified under Authentication Bypass by Spoofing. CVSS score: 6.5/10. Published 2025-11-26.
- How severe is CVE-2025-12653?
- Medium severity. CVSS v3 base score is 6.5 out of 10.