Auth bypass in GitLab
CVE-2025-6171
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.2 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker with reporter access to view branch names and pipeline details by accessing the packages API endpoint even when repository access was disabled.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- GitLab — versions 13.2, 18.4, 18.5
Weakness classification (CWE)
References
- about.gitlab.com/releases/2025/11/12/patch-release-gitlab-18-5-2-released/ (Release Notes, Vendor Advisory)
- gitlab.com/gitlab-org/gitlab/-/issues/549730 (issue-tracking, permissions-required, Broken Link)
- hackerone.com/reports/3183740 (Permissions Required, technical-description, permissions-required, exploit)
Frequently asked questions
- What is CVE-2025-6171?
- CVE-2025-6171 is a medium-severity vulnerability in GitLab, classified under Missing Authorization. CVSS score: 5.3/10. Published 2025-11-15.
- How severe is CVE-2025-6171?
- Medium severity. CVSS v3 base score is 5.3 out of 10.