CVE-2026-18252: Inclusion of Functionality from Untrusted Control Sphere in GitLab
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 19.1.7 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 19.2.5 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 19.3.1
Event History
Frequently Asked Questions
Who can exploit this issue?
An authenticated user with Developer-role permissions could exploit the issue, under certain conditions. The affected execution occurs in a CI context.
What access and interaction does exploitation require?
The vector is network-accessible, and exploitation has low attack complexity. The attacker must already have low-level privileges and user interaction is required.
Which GitLab EE versions need remediation?
Affected versions are 18.9 through versions before 19.1.7, 19.2 through versions before 19.2.5, and 19.3 through versions before 19.3.1. Upgrade to 19.1.7, 19.2.5, 19.3.1, or a later release in the applicable release line.