Improper authorization in GitLab EE affecting all versions since 13.4 allowed a user who previously had the necessary access to trigger deployments to protected environments under specific conditions after the access has been removed
https://hackerone.com/reports/1113783
https://gitlab.com/gitlab-org/gitlab/-/issues/323794
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22253.json