A vulnerability was discovered in GitLab versions before 12.2. GitLab was vulnerable to a SSRF attack through the Outbound Requests feature.
https://hackerone.com/reports/1055816
https://gitlab.com/gitlab-org/gitlab/-/issues/293733
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-22179.json