Why should SharePoint Apps be hosted on a different domain than SharePoint sites?

You must configure a new name in Domain Name Services (DNS) to host SharePoint apps.

The domain name should not be a subdomain of your existing domain (used to host SharePoint sites) to help prevent unauthorized access to user data and to reduce the possibility of cross-site scripting attacks.

For example, if SharePoint sites are at Contoso.com, consider ContosoApps.com instead of App.Contoso.com as the domain name. For more information, see Plan for apps for SharePoint 2013.

 

 

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