Improper authorization in GitLab 12.8+ allows a guest user in a private project to view tag data that should be inaccessible on the releases page
https://hackerone.com/reports/833334
https://gitlab.com/gitlab-org/gitlab/-/issues/212911
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22172.json