Cross-site scripting (XSS) vulnerability in adduser.php in PHP-AGTC Membership System 1.1a and earlier allows remote attackers to inject arbitrary web script or HTML via the email address (useremail parameter).
https://exchange.xforce.ibmcloud.com/vulnerabilities/26703
http://www.vupen.com/english/advisories/2006/2020
http://www.securityfocus.com/bid/18127