Under specialized conditions, GitLab may allow a user with an impersonation token to perform Git actions even if impersonation is disabled. This vulnerability is present in GitLab CE/EE versions before 13.12.9, 14.0.7, 14.1.2
https://gitlab.com/gitlab-org/gitlab/-/issues/297516
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22237.json