Ticket #37126: 37126.diff

src/wp-admin/js/updates.js

@@ -2087 +2087 @@
 
                         $.support.postMessage = !! window.postMessage;
 
-                        if ( false === $.support.postMessage || null === target ) {
+                        if ( false === $.support.postMessage || null === target || -1 !== window.parent.location.pathname.indexOf( 'update-core.php' ) ) {
                                 return;
                         }