Is Post-Form Resubmission somehow prevented in WordPress 4.2.2?

If you’re refering to WP internal forms:

WordPress has an built in security mechanism called “wp nonces” (https://codex.wordpress.org/WordPress_Nonces) – that’s an unique hash generated for every WP-form. Every Backend code should check for the according nonce to make sure that

  1. The form submission wasn’t done from outside (usually attacks or bots)
  2. The form submission was done only once (usually unwanted reloads by users, bots or multiple submission cheating)

To check, have a look into the source code and search for a hidden field called wp_nonce or similar.

BR from Salzburg!

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