Simple Form Security

First read this post: Make your CakePHP forms a lot more secure

The nuts and bolts of it is that by simply adding the Security component, it will automatically add a hash to all your forms and if someone tries modifying your form, it won't work.

And you can implment it as easy as this: Edit /app/app_controller.php and change the var $components line to include Security like this:

    var $components = array('Auth', 'Security', 'Session');