Authorization Flaw in GitLab CE/EE Allows Data Exposure
CVE-2026-13319

4.3MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
21 October 2026

What is CVE-2026-13319?

An authorization flaw was identified in GitLab CE/EE that permits authenticated users to access sensitive milestone metadata from private projects across the instance. This issue stems from insufficient authorization checks on user-supplied project filter parameters within the group milestones API, potentially enabling data exposure without necessary project membership. GitLab has issued patches to rectify this vulnerability in affected versions.

Affected Version(s)

GitLab 15.10 < 19.3.6

GitLab 19.4 < 19.4.3

GitLab 19.5 < 19.5.1

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/604064
https://hackerone.com/reports/3792168
technical-descriptionexploitpermissions-required
https://docs.gitlab.com/releases/patches/patch-release-gi...

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks [a0xnirudh](https://hackerone.com/a0xnirudh) for reporting this vulnerability through our HackerOne bug bounty program
.