Auth bypass in GitLab
CVE-2026-2726
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 11.10 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to perform unauthorized actions on merge requests in other projects due to improper access control during cross-repository operations.
Vulnerability class: Broken Access Control
Published · last modified .
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:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.2% 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 18.10.0, 18.10, 11.10
Weakness classification (CWE)
References
- hackerone.com/reports/3543886 (Permissions Required, technical-description, permissions-required, exploit)
- gitlab.com/gitlab-org/gitlab/-/work_items/590717 (Broken Link)
- about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/ (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-2726?
- CVE-2026-2726 is a medium-severity vulnerability in GitLab, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-03-25.
- How severe is CVE-2026-2726?
- Medium severity. CVSS v3 base score is 4.3 out of 10.