Cross-site scripting (XSS) vulnerability in signup.asp in CmailServer WebMail 5.3.4 and earlier allows remote attackers to inject arbitrary web script or HTML via the POP3Mail parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/33501
http://www.securityfocus.com/bid/23360
http://www.securityfocus.com/archive/1/464966/100/0/threaded
http://securityreason.com/securityalert/2529