This script is Copyright (C) 2010-2014 Tenable Network Security, Inc.
The remote FreeBSD host is missing a security-related update.
The Piwik security advisory reports :
A non-persistent, cross-site scripting vulnerability (XSS) was found
in Piwik's Login form that reflected the form_url parameter without
being properly escaped or filtered.
See also :
Update the affected package.
Risk factor :
Medium / CVSS Base Score : 4.3