Vulnerability in GitLab
CVE-2026-18252
GitLab has remediated an issue in GitLab EE affecting all versions from 18.9 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user with developer-role permissions could have executed arbitrary commands in a CI context, due to the Claude agent processing configuration from a user-controlled source.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.2% 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: +0.001
Affected products
- GitLab — versions 19.3.0
Weakness classification (CWE)
References
- gitlab.com/gitlab-org/gitlab/-/work_items/607342 (Issue Tracking)
- hackerone.com/reports/3863650 (Permissions Required, technical-description, permissions-required, Third Party Advisory, exploit)
- docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/ (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-18252?
- CVE-2026-18252 is a high-severity vulnerability in GitLab, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 7.3/10. Published 2026-08-26.
- How severe is CVE-2026-18252?
- High severity. CVSS v3 base score is 7.3 out of 10.