CVE-2026-18252: GitLab

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• GitLab GitLab: from 18.9.0, before 19.1.7 (fixed in 19.1.7); from 19.2.0, before 19.2.5 (fixed in 19.2.5); version 19.3.0 only

Published 2026-08-26. Last modified 2026-08-31.