An Insecure Permissions issue (issue 1 of 3) was discovered in GitLab Community and Enterprise Edition before 11.7.8, 11.8.x before 11.8.4, and 11.9.x before 11.9.2. The "move issue" feature may allow a user to create projects under any namespace on any GitLab instance on which they hold credentials.
https://gitlab.com/gitlab-org/gitlab-ce/issues/56865
https://about.gitlab.com/blog/categories/releases/
https://about.gitlab.com/2019/04/01/security-release-gitlab-11-dot-9-dot-4-released/