GitLab 7.10 through 12.8.1 has Incorrect Access Control. Under certain conditions where users should have been required to configure two-factor authentication, it was not being required.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-2544
https://about.gitlab.com/releases/2020/03/04/gitlab-12-dot-8-dot-2-released/index.html
https://about.gitlab.com/releases/2020/03/04/gitlab-12-dot-8-dot-2-released/