--- a/wp/wp-admin/admin-ajax.php	Tue Jun 09 11:14:17 2015 +0000
+++ b/wp/wp-admin/admin-ajax.php	Mon Oct 14 17:39:30 2019 +0200
@@ -1,6 +1,6 @@
 <?php
 /**
- * WordPress AJAX Process Execution.
+ * WordPress Ajax Process Execution
  *
  * @package WordPress
  * @subpackage Administration
@@ -9,7 +9,7 @@
  */
 
 /**
- * Executing AJAX process.
+ * Executing Ajax process.
  *
  * @since 2.1.0
  */
@@ -21,12 +21,12 @@
 /** Load WordPress Bootstrap */
 require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
 
-/** Allow for cross-domain requests (from the frontend). */
+/** Allow for cross-domain requests (from the front end). */
 send_origin_headers();
 
 // Require an action parameter
 if ( empty( $_REQUEST['action'] ) )
-	die( '0' );
+	wp_die( '0', 400 );
 
 /** Load WordPress Administration APIs */
 require_once( ABSPATH . 'wp-admin/includes/admin.php' );
@@ -56,15 +56,24 @@
 	'hidden-columns', 'update-welcome-panel', 'menu-get-metabox', 'wp-link-ajax',
 	'menu-locations-save', 'menu-quick-search', 'meta-box-order', 'get-permalink',
 	'sample-permalink', 'inline-save', 'inline-save-tax', 'find_posts', 'widgets-order',
-	'save-widget', 'set-post-thumbnail', 'date_format', 'time_format', 'wp-fullscreen-save-post',
+	'save-widget', 'delete-inactive-widgets', 'set-post-thumbnail', 'date_format', 'time_format',
 	'wp-remove-post-lock', 'dismiss-wp-pointer', 'upload-attachment', 'get-attachment',
 	'query-attachments', 'save-attachment', 'save-attachment-compat', 'send-link-to-editor',
 	'send-attachment-to-editor', 'save-attachment-order', 'heartbeat', 'get-revision-diffs',
 	'save-user-color-scheme', 'update-widget', 'query-themes', 'parse-embed', 'set-attachment-thumbnail',
-	'parse-media-shortcode', 'destroy-sessions', 'install-plugin', 'update-plugin', 'press-this-save-post',
-	'press-this-add-category',
+	'parse-media-shortcode', 'destroy-sessions', 'install-plugin', 'update-plugin', 'crop-image',
+	'generate-password', 'save-wporg-username', 'delete-plugin', 'search-plugins',
+	'search-install-plugins', 'activate-plugin', 'update-theme', 'delete-theme', 'install-theme',
+	'get-post-thumbnail-html', 'get-community-events', 'edit-theme-plugin-file',
+	'wp-privacy-export-personal-data',
+	'wp-privacy-erase-personal-data',
+	'update-try-gutenberg-panel',
 );
 
+// Deprecated
+$core_actions_post_deprecated = array( 'wp-fullscreen-save-post', 'press-this-save-post', 'press-this-add-category' );
+$core_actions_post = array_merge( $core_actions_post, $core_actions_post_deprecated );
+
 // Register core Ajax calls.
 if ( ! empty( $_GET['action'] ) && in_array( $_GET['action'], $core_actions_get ) )
 	add_action( 'wp_ajax_' . $_GET['action'], 'wp_ajax_' . str_replace( '-', '_', $_GET['action'] ), 1 );
@@ -75,25 +84,35 @@
 add_action( 'wp_ajax_nopriv_heartbeat', 'wp_ajax_nopriv_heartbeat', 1 );
 
 if ( is_user_logged_in() ) {
+	// If no action is registered, return a Bad Request response.
+	if ( ! has_action( 'wp_ajax_' . $_REQUEST['action'] ) ) {
+		wp_die( '0', 400 );
+	}
+
 	/**
-	 * Fires authenticated AJAX actions for logged-in users.
+	 * Fires authenticated Ajax actions for logged-in users.
 	 *
 	 * The dynamic portion of the hook name, `$_REQUEST['action']`,
-	 * refers to the name of the AJAX action callback being fired.
+	 * refers to the name of the Ajax action callback being fired.
 	 *
 	 * @since 2.1.0
 	 */
 	do_action( 'wp_ajax_' . $_REQUEST['action'] );
 } else {
+	// If no action is registered, return a Bad Request response.
+	if ( ! has_action( 'wp_ajax_nopriv_' . $_REQUEST['action'] ) ) {
+		wp_die( '0', 400 );
+	}
+
 	/**
-	 * Fires non-authenticated AJAX actions for logged-out users.
+	 * Fires non-authenticated Ajax actions for logged-out users.
 	 *
 	 * The dynamic portion of the hook name, `$_REQUEST['action']`,
-	 * refers to the name of the AJAX action callback being fired.
+	 * refers to the name of the Ajax action callback being fired.
 	 *
 	 * @since 2.8.0
 	 */
 	do_action( 'wp_ajax_nopriv_' . $_REQUEST['action'] );
 }
 // Default status
-die( '0' );
+wp_die( '0' );