Cross-site scripting (XSS) vulnerability in maillist.php in PHPMailList 1.8.0 and earlier allows remote attackers to inject arbitrary web script or HTML via the email parameter.
http://www.vupen.com/english/advisories/2006/2690
http://www.securityfocus.com/bid/18840
http://securitytracker.com/id?1016439
http://secunia.com/advisories/20959
http://lostmon.blogspot.com/2006/07/multiple-vulnerabilities-in.html