Due to an issue with incorrect sudo permissions, Zimbra Collaboration Suite (ZCS) suffers from a local privilege escalation issue in versions 9.0.0 and prior, where the 'zimbra' user can effectively coerce postfix into running arbitrary commands as 'root'.
https://twitter.com/ldsopreload/status/1580539318879547392
https://github.com/rapid7/metasploit-framework/pull/17141
http://packetstormsecurity.com/files/169430/Zimbra-Privilege-Escalation.html