Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 11.10 before 18.8.7, 18.9 before 18.9.3, and 18.10 before 18.10.1 that could have allowed an authenticated user to perform unauthorized actions on merge requests in other projects due to improper access control during cross-repository operations.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 11.10 – < 18.8.7, 18.9 – < 18.9.3, 18.10 – < 18.10.1 | 18.8.7 |
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-2026-0103 Kwetsbaarheden verholpen in GitLab NCSC-NL (Netherlands) · Mar 26, 2026
- WID-SEC-2026-0847 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 25, 2026
References
- HackerOne Bug Bounty Report #3543886 technical-description exploit permissions-required
- https://gitlab.com/gitlab-org/gitlab/-/work_items/590717
- https://about.gitlab.com/releases/2026/03/25/patch-release-gitlab-18-10-1-released/