Upgrade to version 6.7.3 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.
Secunia Advisory ID:16682
Related OSVDB ID: 19146
Related OSVDB ID: 19148
Other Advisory URL: http://www.plainblack.com/getwebgui/advisories/security-exploit-found-in-6.x-versions