CVE-2026-4398

GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user could have assigned compliance frameworks from namespaces they were not authorized to access to their own project, due to missing namespace validation on self-managed instances.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/	Release Notes Vendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/work_items/600360	Broken Link
https://hackerone.com/reports/3549150	Permissions Required

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:gitlab:gitlab:::::enterprise:::*
	cpe:2.3:a:gitlab:gitlab:::::enterprise:::*
	cpe:2.3:a:gitlab:gitlab:19.3.0::::enterprise:::

History

28 Sep 2026, 19:09

Type	Values Removed	Values Added
References	~~() https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/ -~~	() https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/ - Release Notes, Vendor Advisory
References	~~() https://gitlab.com/gitlab-org/gitlab/-/work_items/600360 -~~	() https://gitlab.com/gitlab-org/gitlab/-/work_items/600360 - Broken Link
References	~~() https://hackerone.com/reports/3549150 -~~	() https://hackerone.com/reports/3549150 - Permissions Required
First Time		Gitlab Gitlab gitlab
CPE		cpe:2.3:a:gitlab:gitlab:19.3.0::::enterprise::: cpe:2.3:a:gitlab:gitlab:::::enterprise:::*

Information

Published : 2026-04-08 23:16

Updated : 2026-09-28 19:09

NVD link : CVE-2026-4398

Mitre link : CVE-2026-4398

CVE.ORG link : CVE-2026-4398

JSON object : View

Products Affected

gitlab

gitlab

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

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