CVE-2026-18252
Received Received - Intake

Authenticated Command Execution in GitLab CI via User-Controlled Claude Agent

Publication date: 2026-08-26

Last updated on: 2026-08-26

Assigner: GitLab Inc.

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.

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Meta Information

Published
2026-08-26
Last Modified
2026-08-26
Generated
2026-08-26
AI Q&A
2026-08-26
EPSS Evaluated
N/A
NVD
CVE-2026-18252
EUVD
EUVD-2026-66428

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
gitlab gitlab_ee From 18.9 (inc) to 19.1.7 (exc)
gitlab gitlab_ee From 19.2 (inc) to 19.2.5 (exc)
gitlab gitlab_ee From 19.3 (inc) to 19.3.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-829 The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.

Attack-Flow Graph

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Executive Summary

This vulnerability in GitLab EE allows an authenticated user with developer-role permissions to execute arbitrary commands in a CI context. It occurs because the Claude agent processes configuration from a user-controlled source, which can be manipulated to run unauthorized commands.

Impact Analysis

An attacker with developer access could execute malicious commands in CI pipelines, potentially leading to data breaches, unauthorized code changes, or service disruptions. This could compromise project integrity and expose sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized access or data exposure, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations may face legal penalties, reputational damage, and loss of compliance certifications.

Mitigation Strategies

Upgrade GitLab EE to a patched version: 19.1.7, 19.2.5, or 19.3.1 or later. Verify the upgrade was successful and review CI configurations for unauthorized changes.

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