Description
An issue has been discovered in GitLab affecting all versions before 16.4.3, all versions starting from 16.5 before 16.5.3, all versions starting from 16.6 before 16.6.1. Under certain circumstances, a malicious actor bypass prohibited branch checks using a specially crafted branch name to manipulate repository content in the UI.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | < 16.4.3, 16.5 – < 16.5.3, 16.6 – < 16.6.1 | 16.4.3 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | gitlab | No fix yet | — |
Advisories 1
- WID-SEC-2023-3041 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 3, 2026
References
- GitLab Issue #426400 issue-tracking
- HackerOne Bug Bounty Report #2173053 technical-description exploit permissions-required broken-link