Office users can share Excel, PowerPoint, and Word templates they create with other Microsoft Office users around the world by uploading them to the community area of the Microsoft Office Online Web site. If your organization has policies that govern the use of external resources such as Office Online, allowing users to upload templates might enable them to violate those policies.
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2010 -> Tools \ Options \ General \ Web Options... 'Prevent users from uploading document templates to the Office.com Community' to 'Enabled'.
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system Windows.