An issue has been discovered in GitLab EE affecting all versions starting from 15.2 before 15.9.6, all versions starting from 15.10 before 15.10.5, all versions starting from 15.11 before 15.11.1. A malicious group member may continue to have access to the public projects of a public group even after being banned from the public group by the owner.
https://hackerone.com/reports/1850046
https://gitlab.com/gitlab-org/gitlab/-/issues/391433
https://gitlab.com/gitlab-org/cves/-/blob/master/2023/CVE-2023-0805.json