Cloudkit Can we modify data of public database

Question

I have just gone through the cloud kit doc as in this link cloudkit but not getting clear about to modify database records for public database. As per this description in cl

Answer 1

In the CloudKit dashboard you are able to change the access rights. So it would be possible to make records writable by others. You do have to be careful with this. When your app runs on a jailbroken device, then it's possible to execute methods with arbitrary arguments. This is a high security risk.