An issue has been discovered in GitLab affecting all versions starting from 8.1 to 15.8.5, and from 15.9 to 15.9.4, and from 15.10 to 15.10.1. It was possible to add a branch with an ambiguous name that could be used to social engineer users.
https://hackerone.com/reports/1831547
https://gitlab.com/gitlab-org/gitlab/-/issues/388962
https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0450.json