Multiple cross-site scripting (XSS) vulnerabilities in the billing system for Parallels Plesk Panel 10.3.1_build1013110726.09 allow remote attackers to inject arbitrary web script or HTML via crafted input to a PHP script, as demonstrated by admin/index.php/default and certain other files.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.