Auth bypass in Gitlab
CVE-2025-12555
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.1 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that, under certain conditions, could have allowed an authenticated user to access previous pipeline…
Vulnerability class: Broken Access Control
EPSS: 0.000 (5.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Gitlab — versions 15.1, 18.8, 18.9
Weakness classification (CWE)
References
- HackerOne Bug Bounty Report #3354642 (technical-description, exploit, permissions-required)
- gitlab.com/gitlab-org/gitlab/-/work_items/579126
- about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/
Frequently asked questions
- What is CVE-2025-12555?
- CVE-2025-12555 is a medium-severity vulnerability in Gitlab, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-03-11.
- How severe is CVE-2025-12555?
- Medium severity. CVSS v3 base score is 4.3 out of 10.