CVE-2026-18252

⚠️ high

Summary

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 Score

7.3

High

EPSS Score

0.3

Exploit Probability

Published Date

2026-08-26

First Seen: 2026-08-28

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 54.3% of all 364,858 vulnerabilities in our database.

#166,836

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Aug 26, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

Thanks [thwin_htet](https://hackerone.com/thwin_htet) for reporting this vulnerability through our HackerOne bug bounty program

SSVC data provided by CISA

Last Modified 2026-08-31

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

CWE IDs (Weakness Types)

CWE-829

📦 Affected Products 3

Vendor	Product	Status	Affected Versions
gitlab	gitlab	Affected	> 18.9.0 < 19.1.7
gitlab	gitlab	Affected	> 19.2.0 < 19.2.5
gitlab	gitlab	Affected	v19.3.0

🔗 References 3

https://docs.gitlab.com/releases/patches/patch-relea...

Release Notes Vendor Advisory

https://gitlab.com/gitlab-org/gitlab/-/work_items/60...

Issue Tracking

https://hackerone.com/reports/3863650

Permissions Required Third Party Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-10518	🔶 medium	4.3	0.3	GitLab has remediated an issue in GitLab EE affecting all versions from 17.9 before 19.2.7, 19.3 before 19.3.3, and 19.4...	2026-09-29
CVE-2026-4523	ℹ️ low	3.7	0.4	GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.11 before 19.2.7, 19.3 before 19.3.3, and ...	2026-09-29
CVE-2026-84739	⚠️ high	8.7	0.5	GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and ...	2026-09-29
CVE-2026-8937	🔶 medium	4.3	0.3	GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.0 before 19.2.7, 19.3 before 19.3.3, and 1...	2026-09-29
CVE-2026-89078	⛔ critical	9.9	0.4	GitLab has remediated an issue in GitLab CE/EE affecting all versions from 19.2 before 19.2.7, 19.3 before 19.3.3, and 1...	2026-09-24
CVE-2026-92470	⚠️ high	7.7	0.2	GitLab has remediated an issue in GitLab EE affecting all versions from 18.7 before 19.2.7, 19.3 before 19.3.3, and 19.4...	2026-09-24

These CVEs affect the same products