For GitLab before 13.0.12, 13.1.6, 13.2.3 user controlled git configuration settings can be modified to result in Server Side Request Forgery.
https://hackerone.com/reports/855276
https://gitlab.com/gitlab-org/gitlab/-/issues/215212
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13286.json