Dataleak on fully-private Wiki on Delete page

Reproduction Steps:

• Prevent guest user from being able to view any page through Global Administration Rights settings
• Log out
• Go to : <server>/bin/loginsubmit/?xpage=delete

Result:

• Page title, author complete name are shown
• link containing its username is available in page source code
• Number of children and number of backlinks of current page are also displayed

Expected Result:

• On a fully-private Wiki, this particular page should not be accessible and these informations should not be accessible