Cross-site scripting (XSS) vulnerability in the Site Editor (aka SiteBuilder) feature in Parallels Plesk Panel 10.4.4_build20111103.18 allows remote attackers to inject arbitrary web script or HTML via the login parameter to preferences.html.
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.