GitLab Community and Enterprise Edition 8.9 and later and before 11.5.0-rc12, 11.4.6, and 11.3.10 has Incorrect Access Control.
https://gitlab.com/gitlab-org/gitlab-ce/issues/54189
https://about.gitlab.com/blog/categories/releases/
https://about.gitlab.com/2018/11/19/critical-security-release-gitlab-11-dot-4-dot-6-released/