Auth bypass in GitLab
CVE-2026-9807
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.9 before 18.10.7, 18.11 before 18.11.4, and 19.0 before 19.0.1 that under certain conditions could have allowed a blocked Project Access Token to continue accessing private resources due to incorrect authorization enforcement.
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:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.7% 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 19.0.0, 18.11, 19.0
Weakness classification (CWE)
References
- hackerone.com/reports/3554993 (Permissions Required, technical-description, permissions-required, exploit)
- gitlab.com/gitlab-org/gitlab/-/work_items/590694 (Broken Link)
- about.gitlab.com/releases/2026/05/27/patch-release-gitlab-19-0-1-released/ (Release Notes)
Frequently asked questions
- What is CVE-2026-9807?
- CVE-2026-9807 is a medium-severity vulnerability in GitLab, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-05-28.
- How severe is CVE-2026-9807?
- Medium severity. CVSS v3 base score is 4.3 out of 10.