Cross-site scripting (XSS) vulnerability in error413.php in Kerio MailServer before 6.6.2 allows remote attackers to inject arbitrary web script or HTML via the sent parameter. NOTE: some of these details are obtained from third party information.
https://exchange.xforce.ibmcloud.com/vulnerabilities/47398
http://www.vupen.com/english/advisories/2008/3442
http://www.securityfocus.com/bid/32863
http://www.kerio.com/security_advisory.html