An issue has been discovered in GitLab CE/EE affecting all versions from 13.8 and above allowing an authenticated user to delete incident metric images of public projects.
https://hackerone.com/reports/1107281
https://gitlab.com/gitlab-org/gitlab/-/issues/323452
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22198.json