Cross-site scripting (XSS) vulnerability in Invision Power Board (IPB) 2.1.5 and earlier before 20060308 allows remote attackers to inject arbitrary web script or HTML via a Private Message (PM) in certain circumstances.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25384
http://www.vupen.com/english/advisories/2006/1044
http://www.securityfocus.com/bid/17187