Improper Authorization in GitLab CE/EE Affects Pipeline Security
CVE-2026-15423

8.5HIGH

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
12 August 2026

What is CVE-2026-15423?

A vulnerability has been identified in GitLab CE/EE where under specific conditions, an authenticated user with developer-role permissions can execute CI/CD pipelines on a protected branch without having the necessary push permissions. This is due to a flaw in pipeline reference validation, which may lead to unauthorized actions in the CI/CD workflow. GitLab has addressed this issue in recent patches to enhance security and safeguard against potential misuse.

Affected Version(s)

GitLab 19.0 < 19.0.6

GitLab 19.1 < 19.1.4

GitLab 19.2 < 19.2.2

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/605705
https://hackerone.com/reports/3832069
technical-descriptionexploitpermissions-required
https://docs.gitlab.com/releases/patches/patch-release-gi...

CVSS V3.1

Score:
8.5
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks [sim4n6](https://hackerone.com/sim4n6) for reporting this vulnerability through our HackerOne bug bounty program
.