Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 1.0 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user to cause repository downloads to contain different code than displayed in the web interface due to incorrect validation of branch references under certain circumstances.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 1.0 – < 18.7.6, 18.8 – < 18.8.6, 18.9 – < 18.9.2 | 18.7.6 |
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 2
- NCSC-2026-0093 Kwetsbaarheden verholpen in GitLab NCSC-NL (Netherlands) · Mar 12, 2026
- WID-SEC-2026-0697 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 11, 2026
References
- HackerOne Bug Bounty Report #3505165 technical-description exploit permissions-required
- https://gitlab.com/gitlab-org/gitlab/-/work_items/587002
- https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/