High severity7.3NVD Advisory· Published Aug 26, 2026· Updated Aug 31, 2026
CVE-2026-18252
CVE-2026-18252
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Range: from 18.9 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1
Patches
Vulnerability mechanics
References
2- docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/nvdRelease NotesVendor Advisory
- hackerone.com/reports/3863650nvdPermissions RequiredThird Party Advisory
News mentions
3- GitLab Fixes Claude AI Agent Flaw That Could Execute Arbitrary Commands in CI PipelineCyber Security News · Aug 27, 2026
- GitLab EE: Five Vulnerabilities Including High-Severity Command Execution Patched TogetherVypr Intelligence · Aug 26, 2026
- GitLab Patch Release: 19.3.1, 19.2.5, 19.1.7GitLab Security Releases · Aug 26, 2026