Cross-site scripting (XSS) vulnerability in u2u.php in XMB 1.9.3 allows remote attackers to inject arbitrary web script or HTML via the username parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/22990
https://docs.xmbforum2.com/index.php?title=Security_Issue_History
http://www.vupen.com/english/advisories/2005/2333