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.

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.

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.

Affected products

Gitlab

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

cve@gitlab.com
cve@gitlab.com (technical-description, permissions-required, exploit)
cve@gitlab.com

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.