Cross-site scripting (XSS) vulnerability in TinyPHPForum (TPF) 3.6 and earlier allows remote attackers to inject arbitrary web script via a javascript: scheme in an "[a]" bbcode tag, possibly the txt parameter to action.php.
http://www.vupen.com/english/advisories/2006/0054
http://www.securityfocus.com/archive/1/420933/100/0/threaded
http://securityreason.com/securityalert/320