An issue has been discovered in GitLab CE/EE affecting all versions before 15.8.5, 15.9.4, 15.10.1. Open redirects was possible due to framing arbitrary content on any page allowing user controlled markdown
https://hackerone.com/reports/1817250
https://gitlab.com/gitlab-org/gitlab/-/issues/387638
https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0155.json