A specially crafted request could be used to confirm the existence of files hosted on object storage services, without disclosing their contents. This vulnerability affects GitLab CE/EE 12.10 and later through 13.0.1
https://hackerone.com/reports/848415
https://gitlab.com/gitlab-org/gitlab/-/issues/214220
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13268.json