Ticket #8553: 8553.2.diff

wp-includes/shortcodes.php

@@ -175 +175 @@
         $tagnames = array_keys($shortcode_tags);
         $tagregexp = join( '|', array_map('preg_quote', $tagnames) );
 
-        return '(.?)\[('.$tagregexp.')\b(.*?)(?:(\/))?\](?:(.+?)\[\/\2\])?(.?)';
+        return '(.?)\[('.$tagregexp.')\b([^\[\]\r\n]*?)(?:(\/))?\](?:(.+?)\[\/\2\])?(.?)';
 }
 
 /**