PBL Guestbook v1.31 - XSS

PBLGuestbook v1.31 Homepage: http://www.pixelatedbylev.com/ Effected files: input boxes of the guestbook. XSS Vulnerabilities PoC: I noticed that common tags like script are filtered into the words "SCRIPT BLOCKED" in this guestbook, however img tags as well as others go unfiltered in the Name,...