title: Prevent change of hidden field
body: <p>What if I have ChangePassword form with hidden ID field of the user.</p>
  <p>BadPerson knows id of GoodPerson. He opens Change Password form with FireBug, changes his Id to GoodPerson's Id, so password changes for GoodPerson.</p>
  <p>Of course I can create some server logic that will prevent this, but I think there should be some out of the box solution, which throws if hidden field been changed, which I don't know.</p>
  <p><strong>EDIT</strong>
  Ok, Change Password is a bad example. Any edit form where I have id in hidden field has same problem.</p>