phazizGuestbook v2.0 - XSS

phazizGuestbook v2.0 Homepage: http://www.devhome.de/englishversion Effected files: input boxes of name, email, url, text. XSS Vulnerability: None of these input boxes sanatize user input before generating it. for PoC put IMG SRC=javascript:alert&00000XSS' in any of the above boxes...