Stalwart Mail Server is an open-source mail server. Prior to version 0.8.0, when using "RUN_AS_USER", the specified user (and therefore, web interface admins) can read arbitrary files as root. This issue affects admins who have set up to run stalwart with "RUN_AS_USER" who handed out admin credentials to the mail server but expect these to only grant access according to the "RUN_AS_USER" and are attacked where the attackers managed to achieve Arbitrary Code Execution using another vulnerability. Version 0.8.0 contains a patch for the issue.