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Regarding Guest Site User Critical Update on oct 5th 2018

Hello All,
It is related to below critical update


It impacted our org with third party integration(C&P Temporary contact processing). In our org, Campaign OWD is private and it became unavailable for guest user after this update. After enabling campaign sharing rules for guest user, that part worked fine. 
However non admin user couldn't process temp contacts. C&P claims its not their issue and we were asked to contact saleforce. 
Now we wonder non-admins can't view guest user records.
My question here is What are all the permission removed during this critical update? Whether non-admins had access to guest user records before this critical updates and now is it removed ?
Little confused on this part. Any info please.