Access Control Flaw in GitLab EE Affects Multiple Versions
CVE-2026-4398

5.4MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
27 August 2026

What is CVE-2026-4398?

An access control vulnerability in GitLab EE allows authenticated users to incorrectly assign compliance frameworks from unauthorized namespaces to their own projects. This occurs due to insufficient namespace validation on self-managed instances, which can lead to unauthorized access and potential misuse of compliance frameworks. Users are urged to update to the latest versions to mitigate this issue.

Affected Version(s)

GitLab 18.3 < 19.1.7

GitLab 19.2 < 19.2.5

GitLab 19.3 < 19.3.1

References

https://hackerone.com/reports/3549150
technical-descriptionexploitpermissions-required
https://gitlab.com/gitlab-org/gitlab/-/work_items/600360
https://docs.gitlab.com/releases/patches/patch-release-gi...

CVSS V3.1

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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