MTP Guestbook allows you to put a guestbook on your website. Your visitors can sign it and leave a message. The entries can be edited and deleted in the admin area.
MTP Guestbook script suffers from multiple stored cross-site scripting vulnerabilities. The issues are triggered when input passed via several parameters to several scripts is not properly sanitized before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.