An issue has been discovered in GitLab affecting all versions starting from 15.6 before 15.8.5, 15.9 before 15.9.4, and 15.10 before 15.10.1. An XSS was possible via a malicious email address for certain instances.
https://hackerone.com/reports/1842867
https://gitlab.com/gitlab-org/gitlab/-/issues/389487
https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0523.json