Auth bypass in GitLab
CVE-2026-6269
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.10 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions could have allowed an authenticated user with developer-role permissions to modify hidden merge requests due to incorrect authorization enforcements.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 18.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- GitLab — versions 18.11, 15.10, 19.0
Weakness classification (CWE)
References
- about.gitlab.com/releases/2026/06/10/patch-release-gitlab-19-0-2-released/ (Release Notes)
- gitlab.com/gitlab-org/gitlab/-/work_items/596625 (Issue Tracking)
- hackerone.com/reports/3661880 (Permissions Required, technical-description, permissions-required, exploit)
Frequently asked questions
- What is CVE-2026-6269?
- CVE-2026-6269 is a medium-severity vulnerability in GitLab, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-06-11.
- How severe is CVE-2026-6269?
- Medium severity. CVSS v3 base score is 5.4 out of 10.