An issue was discovered in GitLab Community and Enterprise Edition before 11.0.6, 11.1.x before 11.1.5, and 11.2.x before 11.2.2. There is Missing Authorization Control for API Repository Storage.
https://gitlab.com/gitlab-org/gitlab-ce/issues/49947
https://about.gitlab.com/2018/08/28/security-release-gitlab-11-dot-2-dot-2-released/