We are using a VF Page to display the latest products invoiced of an Account. Those values are retrieved from the Sales Lines (Custom Object) which are set private. 

However, Users who can access the Account, can also see the VF Page (as they need it for their own Accounts) and at the moment also get data desplayed in the VF they shouldn't see. Is there a way to prevent users seeing data in the VF they shouldn't?