A vulnerability was discovered in GitLab versions before 13.1.10, 13.2.8 and 13.3.4. GitLab was not invalidating project invitation link upon removing a user from a project.
https://hackerone.com/reports/492621
https://gitlab.com/gitlab-org/gitlab/-/issues/26801
https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13305.json