Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2 before 18.8.9, 18.9 before 18.9.5, and 18.10 before 18.10.3 that could have allowed an authenticated user with custom role permissions to demote or remove higher-privileged group members due to improper authorization checks on member management operations.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 18.2 – < 18.8.9, 18.9 – < 18.9.5, 18.10 – < 18.10.3 | 18.8.9 |
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-2026-1010 GitLab CE/EE: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 7, 2026
References
- HackerOne Bug Bounty Report #3301240 technical-description exploit permissions-required
- https://gitlab.com/gitlab-org/gitlab/-/work_items/565414
- https://about.gitlab.com/releases/2026/04/08/patch-release-gitlab-18-10-3-released/