High severity · published Aug 26, 2026
CVE-2026-18252
Inclusion of Functionality from Untrusted Control Sphere in GitLab
8.1
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
18.9 before 19.1.7; 19.2 before 19.2.5; 19.3 before 19.3.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18252
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18252
Release Notes
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/
Issue Tracking
https://gitlab.com/gitlab-org/gitlab/-/work_items/607342
Permissions Required
https://hackerone.com/reports/3863650
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