An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.4 before 13.6.2. Information disclosure via GraphQL results in user email being unexpectedly visible.
https://hackerone.com/reports/972355
https://gitlab.com/gitlab-org/gitlab/-/issues/244275
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26413.json