diff --git a/bbs/good.php b/bbs/good.php
index a82dd1495..d0f66d802 100644
--- a/bbs/good.php
+++ b/bbs/good.php
@@ -1,6 +1,8 @@
 <?php
 include_once('./_common.php');
 
+$good = isset($_REQUEST['good']) ? preg_replace('/[^a-z0-9]/i', '', $_REQUEST['good']) : '';
+
 run_event('bbs_good_before', $bo_table, $wr_id, $good);
 
 @include_once($board_skin_path.'/good.head.skin.php');
diff --git a/bbs/link.php b/bbs/link.php
index 7fbc19a4a..8f8b9046c 100644
--- a/bbs/link.php
+++ b/bbs/link.php
@@ -1,7 +1,11 @@
 <?php
 include_once('./_common.php');
 
-$html_title = '링크 &gt; '.conv_subject($write['wr_subject'], 255);
+$html_title = '링크';
+
+if (isset($write['wr_subject']) && $write['wr_subject']) {
+    $html_title .= ' &gt; '.conv_subject($write['wr_subject'], 255);
+}
 
 $no = isset($_REQUEST['no']) ? preg_replace('/[^0-9]/i', '', $_REQUEST['no']) : '';
 
@@ -10,10 +14,10 @@ if (!($bo_table && $wr_id && $no))
 
 // SQL Injection 예방
 $row = sql_fetch(" select count(*) as cnt from {$g5['write_prefix']}{$bo_table} ", FALSE);
-if (!$row['cnt'])
+if (!(isset($row['cnt']) && $row['cnt']))
     alert_close('존재하는 게시판이 아닙니다.');
 
-if (!$write['wr_link'.$no])
+if (!(isset($write['wr_link'.$no]) && $write['wr_link'.$no]))
     alert_close('링크가 없습니다.');
 
 $ss_name = 'ss_link_'.$bo_table.'_'.$wr_id.'_'.$no;
diff --git a/bbs/write.php b/bbs/write.php
index 2192934ca..5efad03e3 100644
--- a/bbs/write.php
+++ b/bbs/write.php
@@ -20,7 +20,7 @@ if (!($w == '' || $w == 'u' || $w == 'r')) {
 }
 
 if ($w == 'u' || $w == 'r') {
-    if ($write['wr_id']) {
+    if (isset($write['wr_id']) && $write['wr_id']) {
         // 가변 변수로 $wr_1 .. $wr_10 까지 만든다.
         for ($i=1; $i<=10; $i++) {
             $vvar = "wr_".$i;