Some of the applications save data on the client side by using serialized objects.
These applications rely on the client to maintain the seat but they will allow the tampering of serialized
data.
An example can be this cookie which is a user normal cookie stored on a computer can be altered by just
changing the rule from user to admin and thus an escalation for the privilege will take place.
The only way to protect against insecure serialization attacks is to encrypt the serialized data.