Multiple cross-site scripting (XSS) vulnerabilities in MyPHPNuke (MPN) 1.88 and earlier allow remote attackers to inject arbitrary web script or HTML via (1) the letter parameter in reviews.php and (2) the dcategory parameter in download.php.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24887
http://www.vupen.com/english/advisories/2006/0750
http://www.securityfocus.com/bid/16815
http://www.securityfocus.com/archive/1/425983/100/0/threaded
http://www.myphpnuke.com/article.php?sid=1035&mode=thread&order=0