HighVulnerabilityLLM-specific

CVE-2026-18252: GitLab EE command execution in CI through Claude agent configuration

Source: NVD(opens in a new tab)
Identifier: CVE-2026-18252
Published: August 26, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.5%

Summary

GitLab has fixed 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. Under certain conditions, an authenticated user with developer-role permissions could execute arbitrary commands in a CI context because the Claude agent processed configuration from a user-controlled source.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 7.3(high)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Attack vector: network
Attack complexity: low
Privileges required: low
User interaction: required
EPSS: 0.5%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.
Disclosure date: August 26, 2026

Weaknesses and techniques

Weakness (CWE): CWE-829
Attack pattern (CAPEC): CAPEC-437

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: Agent
Impact: Integrity,
Confidentiality
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-18252

First tracked: August 26, 2026 at 02:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Summary

Mitigation

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