A vulnerability was discovered in GitLab versions before 13.1.10, 13.2.8 and 13.3.4. Due to improper verification of permissions, an unauthorized user can access a private repository within a public project.
https://hackerone.com/reports/962231
https://gitlab.com/gitlab-org/gitlab/-/issues/238887
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13303.json