Improper access control allows any project member to retrieve the service desk email address in GitLab CE/EE versions starting 12.10 before 14.3.6, all versions starting from 14.4 before 14.4.4, all versions starting from 14.5 before 14.5.2.
https://hackerone.com/reports/1360744
https://gitlab.com/gitlab-org/gitlab/-/issues/342823
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39934.json