How safe is it to use AJAX requests?

Question

PHP

How safe is it to use AJAX requests to edit user information or for any other purpose? How to protect yourself from scammers who can simply change the data that is passed to the php file and change something about the user (for example, password)?

Answer 1

How safe is it to use AJAX requests?

No more secure than bare HTML and submitting data via forms (POST requests).
Nothing new: Authorization. Sessions.
Plus: when setting a new password, it is mandatory to transfer and check the old one (even under an authorized session).

Answer 2

Em. It is exactly as safe as a non-AJAX request.