Cross-site scripting (XSS) vulnerability in usersrecentposts in YaBB 2.0 rc1 allows remote attackers to inject arbitrary web script or HTML via the username parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/19671
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-0786
http://www.securityfocus.com/bid/12756