diff --git a/bbs/register_form_update.php b/bbs/register_form_update.php
index 3185eeaa0..79ce3d407 100644
--- a/bbs/register_form_update.php
+++ b/bbs/register_form_update.php
@@ -74,6 +74,10 @@ $mb_addr2       = addslashes(clean_xss_tags(stripslashes($mb_addr2), 1, 1));
 $mb_addr3       = addslashes(clean_xss_tags(stripslashes($mb_addr3), 1, 1));
 $mb_addr_jibeon = preg_match("/^(N|R|J)$/", $mb_addr_jibeon) ? $mb_addr_jibeon : '';
 
+for ($i = 1; $i <= 10; $i++) {
+    ${'mb_' . $i} = addslashes(clean_xss_tags(stripslashes(${'mb_' . $i}), 1, 1));
+}
+
 $mb_marketing_agree     = isset($_POST['mb_marketing_agree'])   ? trim($_POST['mb_marketing_agree'])    : "0";
 $mb_thirdparty_agree    = isset($_POST['mb_thirdparty_agree'])  ? trim($_POST['mb_thirdparty_agree'])   : "0";