Auth bypass in Gitlab
CVE-2025-9484
GitLab has remediated an issue in GitLab EE affecting all versions from 16.6 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that under certain circumstances could have allowed an authenticated user to have access to other user…
Vulnerability class: Broken Access Control
EPSS: 0.000 (4.2th 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 16.6, 18.9, 18.10
Weakness classification (CWE)
References
- GitLab Issue #565363 (issue-tracking, permissions-required)
- HackerOne Bug Bounty Report #3303810 (technical-description, exploit, permissions-required)
- about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released/
Frequently asked questions
- What is CVE-2025-9484?
- CVE-2025-9484 is a medium-severity vulnerability in Gitlab, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-04-08.
- How severe is CVE-2025-9484?
- Medium severity. CVSS v3 base score is 4.3 out of 10.