Anyone can import CSV file. Pie Register will import users from this file.

It's possible to inject specially crafted reflected XSS even if strip_tags and addslashes is used.

Any registered user can upload any file.

$_GET['mp3'] is not escaped.

preg_match() only check if $_GET['code'] contains at least one letter or digit (missing ^ and $ inside regexp).

Administrator privileges are NOT checked when we pass $_GET['wprss-bulk'].

Slashes are removed from $_GET['condition'].

$_GET['error_message'] is not escaped.