Private group info is leaked leaked in GitLab CE/EE version 10.2 and above, when the project is moved from private to public group. Affected versions are: >=10.2, <13.3.9,>=13.4, <13.4.5,>=13.5, <13.5.2.
https://hackerone.com/reports/748315
https://gitlab.com/gitlab-org/gitlab/-/issues/38281
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13352.json