Description
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.1 that under certain conditions could have allowed an authenticated user to load unauthorized content into another user's browser due to improper input validation in the Mermaid sandbox.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GitLab | GitLab | 18.11 – < 18.11.1 | 18.11.1 |
Advisories 2
- NCSC-2026-0128 Kwetsbaarheden verholpen in GitLab EE en CE NCSC-NL (Netherlands) · Apr 23, 2026
- WID-SEC-2026-1245 GitLab: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 22, 2026
References
- HackerOne Bug Bounty Report #3572752 technical-description exploit permissions-required
- https://gitlab.com/gitlab-org/gitlab/-/work_items/591587