GitLab CE & EE 11.2 and later and before 11.5.0-rc12, 11.4.6, and 11.3.10 have Persistent XSS.
https://gitlab.com/gitlab-org/gitlab-ce/issues/53385
https://about.gitlab.com/blog/categories/releases/
https://about.gitlab.com/2018/11/19/critical-security-release-gitlab-11-dot-4-dot-6-released/