Auth bypass in GitLab
CVE-2026-4868
GitLab has remediated an issue in GitLab EE affecting all versions from 18.8 before 18.10.7, 18.11 before 18.11.4, and 19.0 before 19.0.1 that, under certain conditions, could have allowed an authenticated user to cause specific Duo AI workflows to run under another user's identity due to improper user identity resolution when triggering Duo AI workflow runners.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.3% 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: 0.004 · change: +0.000
Affected products
- GitLab — versions 19.0.0, 18.8, 18.11
Weakness classification (CWE)
References
- gitlab.com/gitlab-org/gitlab/-/work_items/594809 (Broken Link)
- hackerone.com/reports/3619872 (Permissions Required, technical-description, permissions-required, exploit)
- about.gitlab.com/releases/2026/05/27/patch-release-gitlab-19-0-1-released/ (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-4868?
- CVE-2026-4868 is a high-severity vulnerability in GitLab, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.2/10. Published 2026-05-27.
- How severe is CVE-2026-4868?
- High severity. CVSS v3 base score is 8.2 out of 10.