Description
GitLab has remediated an issue in GitLab EE affecting all versions from 16.4 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1 that under certain conditions could have allowed an authenticated user with developer-role permissions to execute arbitrary client-side code in the context of another user's session, due to improper sanitization of user-supplied input.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 16.4 – < 18.11.6, 19.0 – < 19.0.3, 19.1 – < 19.1.1 | 18.11.6 |
Advisories 2
- NCSC-2026-0211 Kwetsbaarheden verholpen in GitLab Community Edition en Enterprise Edition NCSC-NL (Netherlands) · Jun 25, 2026
- WID-SEC-2026-2070 GitLab CE/EE: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 24, 2026
References
- https://gitlab.com/gitlab-org/gitlab/-/work_items/601634
- HackerOne Bug Bounty Report #3734800 technical-description exploit permissions-required
- https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-1-1-released/