Cross-site scripting (XSS) vulnerability in attachment.php in WoltLab Burning Board (WBB) 2.3.5 allows remote attackers to inject arbitrary web script or HTML via a GIF image that contains URL-encoded Javascript.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28481
http://www.securityfocus.com/archive/1/443876/100/0/threaded