- Patch #256509 by dropcube: return a 403 - access denied when an invalid cron key is used.

cron.php

@@ -13,4 +13,5 @@
 }
 else {
   watchdog('cron', 'Cron did not run because an invalid key used.', array(), WATCHDOG_NOTICE);
+  drupal_access_denied();
 }