Provide references for CVE-2021-39868.
Where can I find more information about CVE-2021-39868?
References are available at: https://gitlab.com/gitlab-org/gitlab/-/issues/24649, https://hackerone.com/reports/420258, https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39868.json.