What’s Vulnerable › Vulnerabilities

CVE-2026-18252: Inclusion of Functionality from Untrusted Control Sphere in GitLab

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-08-31
• Weakness: CWE-829

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.

Affected products

• GitLab: from 18.9.0 before 19.1.7; from 19.2.0 before 19.2.5; 19.3.0 — fixed in 19.1.7, 19.2.5

How to fix

Upgrade to a fixed version: GitLab 19.1.7, 19.2.5. Check the vendor advisory for mitigations.

References

• https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/
• https://gitlab.com/gitlab-org/gitlab/-/work_items/607342
• https://hackerone.com/reports/3863650

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