CVE-2026-4398

Authorization Bypass Through User-Controlled Key in GitLab

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.

Affected

GitLab

CVSS v3.1 GITLAB

5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS

0.29% chance of exploitation in the next 30 days, 21st percentile

Published

2026-08-27

Updated

2026-08-28

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3549150

Security advisories

• https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released

References

• CVE Record
• NVD entry