This patch fix some security issues in vtiger 5.0.4,which could be used by Cross-Site-Scripting (XSS).
XSS make possible scripts indirectly to the browser of the victim to send and thus damage code on the side of the client to implement.
Update your vtiger with new fixed files from archive. copy & paste the folders include,modules and themes […]

The latest development of vtiger CRM 5.1 is installed at http://en.vtiger.com/wip
The following features are available:
* Popup Reminder for Calendar Events [popupreminder.pdf]
* Multi Currency Support [multicurrency.pdf]
* Duplicate Records Handling […]