In MongoDB Ops Manager v5.0 prior to 5.0.22 and v6.0 prior to 6.0.17 it is possible for an authenticated user with project owner or project user admin access to generate an API key with the privileges of org owner resulting in privilege escalation.
https://www.mongodb.com/docs/ops-manager/v5.0/release-notes/application/#onprem-server-5-0-22
https://www.mongodb.com/docs/ops-manager/current/release-notes/application/#onprem-server-6-0