Ticket #7559: 7559.diff

wp-includes/default-filters.php

@@ -12 +12 @@
  * @package WordPress
  */
 
-// Strip, trim, kses, special chars for string saves
-$filters = array('pre_term_name', 'pre_comment_author_name', 'pre_link_name', 'pre_link_target',
+// Strip, trim, kses, special chars for string saves, converting lone less than sign to < (rescuing from strip_tags) 
+$filters = array('pre_term_name');
+foreach ( $filters as $filter ) {
+        add_filter($filter, 'trim');
+        add_filter($filter, 'wp_pre_kses_less_than');
+        add_filter($filter, 'strip_tags');
+        add_filter($filter, 'wp_filter_kses');
+        add_filter($filter, 'wp_specialchars', 30);
+}
+
+// Strip, trim, kses, special chars for string saves, without converting less than sign (where invalid or undesirable)
+$filters = array('pre_comment_author_name', 'pre_link_name', 'pre_link_target', 
         'pre_link_rel', 'pre_user_display_name', 'pre_user_first_name', 'pre_user_last_name',
         'pre_user_nickname');
 foreach ( $filters as $filter ) {
+        add_filter($filter, 'trim');
         add_filter($filter, 'strip_tags');
-        add_filter($filter, 'trim');
         add_filter($filter, 'wp_filter_kses');
         add_filter($filter, 'wp_specialchars', 30);
 }