The GUI in Alt-N Technologies MDaemon 7.2 and earlier, including 6.8, executes child processes such as NOTEPAD.EXE with SYSTEM privileges when users create new files, which allows local users with physical access to gain privileges.
Directory traversal vulnerability in WorldClient.cgi in WorldClient for Alt-N Technologies MDaemon 5.0.5.0 and earlier allows local users to delete arbitrary files via a ".." (dot dot) in the Attachments parameter.