diff --git a/admin/cat_options.php b/admin/cat_options.php
index 042adfe96..5fd4d04ce 100644
--- a/admin/cat_options.php
+++ b/admin/cat_options.php
@@ -44,6 +44,7 @@ if (isset($_POST['falsify'])
     and count($_POST['cat_true']) > 0)
 {
   check_pwg_token();
+  check_input_parameter('cat_true', $_POST, true, PATTERN_ID);
   switch ($_GET['section'])
   {
     case 'comments' :
@@ -82,6 +83,7 @@ else if (isset($_POST['trueify'])
          and isset($_POST['cat_false'])
          and count($_POST['cat_false']) > 0)
 {
+  check_input_parameter('cat_false', $_POST, true, PATTERN_ID);
   switch ($_GET['section'])
   {
     case 'comments' :