Authorization Flaw in GitLab CE/EE Affecting Multiple Versions
CVE-2026-9807

4.3MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
28 May 2026

What is CVE-2026-9807?

GitLab has addressed a vulnerability present in GitLab CE/EE which could allow a previously blocked Project Access Token to access private resources. This issue arises due to inadequate enforcement of authorization checks under specific circumstances, posing a risk to sensitive data. It is crucial for users to ensure they are using patched versions of the software to mitigate potential exploitation.

Affected Version(s)

GitLab 18.9 < 18.10.7

GitLab 18.11 < 18.11.4

GitLab 19.0 < 19.0.1

References

https://hackerone.com/reports/3554993
technical-descriptionexploitpermissions-required
https://gitlab.com/gitlab-org/gitlab/-/work_items/590694
https://about.gitlab.com/releases/2026/05/27/patch-releas...

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 [s4dmach1ne](https://hackerone.com/s4dmach1ne) for reporting this vulnerability through our HackerOne bug bounty program
.