Access Control Issue in GitLab CE/EE Affects Multiple Versions
CVE-2026-2726

4.3MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
25 March 2026

What is CVE-2026-2726?

GitLab has addressed a significant access control vulnerability in its CE/EE offerings, impacting users across several versions. This issue allowed authenticated users to potentially carry out unauthorized actions on merge requests in projects not owned by them. The flaw stemmed from improper access control measures during cross-repository interactions. This could compromise project integrity, necessitating urgent updates to versions prior to 18.8.7, 18.9.3, and 18.10.1 to safeguard against such exploits.

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Affected Version(s)

GitLab 11.10 < 18.8.7

GitLab 18.9 < 18.9.3

GitLab 18.10 < 18.10.1

References

https://hackerone.com/reports/3543886
technical-descriptionexploitpermissions-required
https://gitlab.com/gitlab-org/gitlab/-/work_items/590717
https://about.gitlab.com/releases/2026/03/25/patch-releas...

CVSS V3.1

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

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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