Ticket #23187: 23187.diff

wp-includes/formatting.php

@@ -2603 +2603 @@
 
         if ( ! is_array( $protocols ) )
                 $protocols = wp_allowed_protocols();
-        if ( wp_kses_bad_protocol( $url, $protocols ) != $url )
+        $good_protocol_url = wp_kses_bad_protocol( $url, $protocols );
+        if ( strtolower( $good_protocol_url ) != strtolower( $url ) )
                 return '';
 
-        return apply_filters('clean_url', $url, $original_url, $_context);
+        return apply_filters('clean_url', $good_protocol_url, $original_url, $_context);
 }
 
 /**