Vulnerability in GitLab
CVE-2026-5816
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.10 before 18.10.4 and 18.11 before 18.11.1 that could have allowed an unauthenticated user to execute arbitrary JavaScript in a user's browser session due to improper path validation under certain conditions.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.006 (47.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- GitLab — versions 18.10, 18.11, 18.11.0
Weakness classification (CWE)
References
- hackerone.com/reports/3572231 (Permissions Required, technical-description, permissions-required, exploit)
- gitlab.com/gitlab-org/gitlab/-/work_items/592816 (Broken Link)
- about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/ (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-5816?
- CVE-2026-5816 is a high-severity vulnerability in GitLab, classified under CWE-41. CVSS score: 8.0/10. Published 2026-04-22.
- How severe is CVE-2026-5816?
- High severity. CVSS v3 base score is 8.0 out of 10.