Auth bypass in GitLab
CVE-2026-6976
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.9 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 hide changes from merge request diff views due to improper input handling of file names.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (12.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.4% 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: 0.002 · change: +0.001
Affected products
- GitLab — versions 15.9, 18.11, 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/598165 (Issue Tracking)
- hackerone.com/reports/3638136 (Permissions Required, technical-description, permissions-required, exploit)
Frequently asked questions
- What is CVE-2026-6976?
- CVE-2026-6976 is a low-severity vulnerability in GitLab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 3.7/10. Published 2026-06-11.
- How severe is CVE-2026-6976?
- Low severity. CVSS v3 base score is 3.7 out of 10.