An authorization issue relating to project maintainer impersonation was identified in GitLab EE 9.5 and later through 13.0.1 that could allow unauthorized users to impersonate as a maintainer to perform limited actions.
https://hackerone.com/reports/819821
https://gitlab.com/gitlab-org/gitlab/-/issues/211940
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13263.json