Index: wp-admin/network/admin-ajax.php
===================================================================
--- wp-admin/network/admin-ajax.php	(Revision 0)
+++ wp-admin/network/admin-ajax.php	(Arbeitskopie)
@@ -0,0 +1,68 @@
+<?php
+/**
+ * WordPress AJAX Process Execution.
+ *
+ * @package WordPress
+ * @subpackage Administration
+ *
+ * @link https://codex.wordpress.org/AJAX_in_Plugins
+ */
+
+/**
+ * Executing AJAX process.
+ *
+ * @since 2.1.0
+ */
+define( 'DOING_AJAX', true );
+if ( ! defined( 'WP_NETWORK_ADMIN' ) ) {
+	define( 'WP_NETWORK_ADMIN', true );
+}
+
+/** Load WordPress Bootstrap */
+require_once( dirname( dirname( dirname( __FILE__ ) ) . '/wp-load.php' ) );
+
+/** Allow for cross-domain requests (from the front end). */
+send_origin_headers();
+
+// Require an action parameter
+if ( empty( $_REQUEST['action'] ) )
+	die( '0' );
+
+/** Load WordPress Administration APIs */
+require_once( ABSPATH . 'wp-admin/includes/admin.php' );
+
+/** Load Ajax Handlers for WordPress Core */
+require_once( ABSPATH . 'wp-admin/includes/ajax-actions.php' );
+
+@header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) );
+@header( 'X-Robots-Tag: noindex' );
+
+send_nosniff_header();
+nocache_headers();
+
+/** This action is documented in wp-admin/admin.php */
+do_action( 'admin_init' );
+
+if ( is_user_logged_in() ) {
+	/**
+	 * Fires authenticated AJAX actions for logged-in users.
+	 *
+	 * The dynamic portion of the hook name, `$_REQUEST['action']`,
+	 * refers to the name of the AJAX action callback being fired.
+	 *
+	 * @since 2.1.0
+	 */
+	do_action( 'wp_network_ajax_' . $_REQUEST['action'] );
+} else {
+	/**
+	 * Fires non-authenticated AJAX actions for logged-out users.
+	 *
+	 * The dynamic portion of the hook name, `$_REQUEST['action']`,
+	 * refers to the name of the AJAX action callback being fired.
+	 *
+	 * @since 2.8.0
+	 */
+	do_action( 'wp_network_ajax_nopriv_' . $_REQUEST['action'] );
+}
+// Default status
+die( '0' );