Fantastic GuestBook version 2.0.1 suffers from XSS due to improper input sanitization.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/48322/fan-Guestbookv2.0.1.txt
Source: https://packetstormsecurity.com/files/48322/fan-Guestbookv2.0.1.txt.html