Hi there, 

As part of the Guest User access impact, has anyone encountered the error

'system.VisualforceException: Update access denied for LotteryApplication__c, controller action methods may not execute.'

Because of which one had to change the existing implementation from Standard Controller to Custom Controller impl for the page used in Guest User Context?

so the usage of apex:inputHidden tag is causing this issue.

Please let me if anyone else faced such issues?

This has led to a lot of design changes to existing implementations related to communities using Guest User functionalities.