🔐 CVE Alert

CVE-2026-4398

MEDIUM 5.4

Authorization Bypass Through User-Controlled Key in GitLab

CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th

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.

CWE CWE-639
Vendor gitlab
Product gitlab
Ecosystems
Industries
Technology
Published Aug 27, 2026
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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Affected Versions

GitLab / GitLab
18.3 < 19.1.7 19.2 < 19.2.5 19.3 < 19.3.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗
hackerone.com: https://hackerone.com/reports/3549150 gitlab.com: https://gitlab.com/gitlab-org/gitlab/-/work_items/600360 docs.gitlab.com: https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/

Credits

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