The remote host is vulnerable to a Script Injection attack.
The remote host is running IceWarp Web Mail, a webmail product written in PHP that is distributed as a standalone application and also bundled with VisNetic Mail Server and Merak Mail Server. The version of IceWarp Web Mail installed on the remote host fails to sanitize user-supplied input to the 'lang_settings' parameter of the 'accounts/inc/include.php' and 'admin/inc/include.php' scripts before using it to include PHP code. An unauthenticated attacker may be able to exploit these flaws to view arbitrary files on the remote host or to execute arbitrary PHP code after injecting it into the mail server's log file.
Upgrade to version 5.6.1 or higher.