An issue was discovered in GitLab Community and Enterprise Edition 11.2 through 12.2.1. Insufficient permission checks were being applied when displaying CI results, potentially exposing some CI metrics data to unauthorized users.
https://gitlab.com/gitlab-org/gitlab-ee/issues/11426
https://about.gitlab.com/2019/08/29/security-release-gitlab-12-dot-2-dot-3-released/