Improper validation of invited users' email address in GitLab EE affecting all versions since 12.2 allowed projects to add members with email address domain that should be blocked by group settings
https://hackerone.com/reports/679567
https://gitlab.com/gitlab-org/gitlab/-/issues/14004
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22251.json