An issue has been discovered in GitLab CE/EE affecting all versions starting from 14.1 before 15.10.8, all versions starting from 15.11 before 15.11.7, all versions starting from 16.0 before 16.0.2. A malicious maintainer in a project can escalate other users to Owners in that project if they import members from another project that those other users are Owners of.
https://hackerone.com/reports/1934811
https://gitlab.com/gitlab-org/gitlab/-/issues/407830
https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-2485.json