SQL injection vulnerability in topic_post.php in XennoBB 2.2.1 and earlier allows remote attackers to execute arbitrary SQL commands via the icon_topic parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28456
http://www.vupen.com/english/advisories/2006/3343
http://www.securityfocus.com/archive/1/443765/100/0/threaded