An issue has been discovered in GitLab affecting all versions starting from 11.6. Pull mirror credentials are exposed that allows other maintainers to be able to view the credentials in plain-text,
https://hackerone.com/reports/928074
https://gitlab.com/gitlab-org/gitlab/-/issues/230864
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22206.json