diff --git a/adm/admin.lib.php b/adm/admin.lib.php
index bbe556db4..5363b6d40 100644
--- a/adm/admin.lib.php
+++ b/adm/admin.lib.php
@@ -436,7 +436,7 @@ function admin_check_xss_params($params){
 
         if( is_array($value) ){
             admin_check_xss_params($params);
-        } else if ( preg_match('/<\s?[^\>]*\/?\s?>/i', $value) && preg_match('/script.*?\/script/ius', $value) ){
+        } else if ( preg_match('/<\s?[^\>]*\/?\s?>/i', $value) && (preg_match('/script.*?\/script/ius', $value) || preg_match('/onload=.*/ius', $value)) ){
             alert('요청 쿼리에 잘못된 스크립트문장이 있습니다.\\nXSS 공격일수도 있습니다.');
             die();
         }
diff --git a/adm/contentform.php b/adm/contentform.php
index 7b7751301..b7bedd389 100644
--- a/adm/contentform.php
+++ b/adm/contentform.php
@@ -109,8 +109,8 @@ include_once (G5_ADMIN_PATH.'/admin.head.php');
         <td>
             <?php echo help("내용에서 iframe 등의 태그를 사용하려면 사용안함으로 선택해 주십시오."); ?>
             <select name="co_tag_filter_use" id="co_tag_filter_use">
-                <option value="1"<?php echo get_selected(1, $co['co_tag_filter_use']); ?>>사용함</option>
-                <option value="0"<?php echo get_selected(0, $co['co_tag_filter_use']); ?>>사용안함</option>
+                <option value="1"<?php echo get_selected($co['co_tag_filter_use'], 1); ?>>사용함</option>
+                <option value="0"<?php echo get_selected($co['co_tag_filter_use'], 0); ?>>사용안함</option>
             </select>
         </td>
     </tr>
diff --git a/adm/menu_list_update.php b/adm/menu_list_update.php
index 4244d3343..324f26209 100644
--- a/adm/menu_list_update.php
+++ b/adm/menu_list_update.php
@@ -23,7 +23,7 @@ for ($i=0; $i<$count; $i++)
 
     $code    = $_POST['code'][$i];
     $me_name = $_POST['me_name'][$i];
-    $me_link = preg_match('/^javascript/', $_POST['me_link'][$i]) ? G5_URL : strip_tags($_POST['me_link'][$i]);
+    $me_link = preg_match('/^javascript/i', $_POST['me_link'][$i]) ? G5_URL : strip_tags($_POST['me_link'][$i]);
     
     if(!$code || !$me_name || !$me_link)
         continue;
diff --git a/bbs/alert.php b/bbs/alert.php
index 9d4475203..b1117d347 100644
--- a/bbs/alert.php
+++ b/bbs/alert.php
@@ -67,13 +67,17 @@ history.back();
     <form method="post" action="<?php echo $url ?>">
     <?php
     foreach($_POST as $key => $value) {
+        
+        $key = clean_xss_tags($url);
+        $value = clean_xss_tags($value);
+
         if(strlen($value) < 1)
             continue;
 
         if(preg_match("/pass|pwd|capt|url/", $key))
             continue;
     ?>
-    <input type="hidden" name="<?php echo $key ?>" value="<?php echo $value ?>">
+    <input type="hidden" name="<?php echo htmlspecialchars($key); ?>" value="<?php echo htmlspecialchars($value); ?>">
     <?php
     }
     ?>
diff --git a/bbs/confirm.php b/bbs/confirm.php
index fcf94e0e9..a80f5eab1 100644
--- a/bbs/confirm.php
+++ b/bbs/confirm.php
@@ -2,9 +2,9 @@
 include_once('./_common.php');
 include_once(G5_PATH.'/head.sub.php');
 
-$url1 = clean_xss_tags($url1);
-$url2 = clean_xss_tags($url2);
-$url3 = clean_xss_tags($url3);
+$url1 = preg_replace("/[\<\>\'\"\\\'\\\"\(\)]/", "", clean_xss_tags($url1));
+$url2 = preg_replace("/[\<\>\'\"\\\'\\\"\(\)]/", "", clean_xss_tags($url2));
+$url3 = preg_replace("/[\<\>\'\"\\\'\\\"\(\)]/", "", clean_xss_tags($url3));
 
 // url 체크
 check_url_host($url1);
diff --git a/bbs/download.php b/bbs/download.php
index 2ebe41742..8a98a32e1 100644
--- a/bbs/download.php
+++ b/bbs/download.php
@@ -84,11 +84,16 @@ if (!get_session($ss_name))
 $g5['title'] = '다운로드 &gt; '.conv_subject($write['wr_subject'], 255);
 
 //파일명에 한글이 있는 경우
+/*
 if(preg_match("/[\xA1-\xFE][\xA1-\xFE]/", $file['bf_source'])){
+    // 2015.09.02 날짜의 파이어폭스에서 인코딩된 문자 그대로 출력되는 문제가 발생됨, 2018.12.11 날짜의 파이어폭스에서는 해당 현상이 없으므로 해당 코드를 사용 안합니다.
     $original = iconv('utf-8', 'euc-kr', $file['bf_source']); // SIR 잉끼님 제안코드
 } else {
     $original = urlencode($file['bf_source']);
 }
+*/
+
+$original = urlencode($file['bf_source']);
 
 @include_once($board_skin_path.'/download.tail.skin.php');
 
diff --git a/bbs/email_certify.php b/bbs/email_certify.php
index 2fc735b32..83465e706 100644
--- a/bbs/email_certify.php
+++ b/bbs/email_certify.php
@@ -1,6 +1,9 @@
 <?php
 include_once('./_common.php');
 
+// 봇의 메일 링크 크롤링을 방지합니다.
+if(function_exists('check_mail_bot')){ check_mail_bot($_SERVER['REMOTE_ADDR']); }
+
 $mb_id  = trim($_GET['mb_id']);
 $mb_md5 = trim($_GET['mb_md5']);
 
diff --git a/bbs/member_confirm.php b/bbs/member_confirm.php
index 722a78302..dcfbfec7a 100644
--- a/bbs/member_confirm.php
+++ b/bbs/member_confirm.php
@@ -14,7 +14,7 @@ else
 $url = clean_xss_tags($_GET['url']);
 
 //소셜 로그인 한 경우
-if( function_exists('social_member_comfirm_redirect') && (! $url || $url === 'register_form.php') ){    
+if( function_exists('social_member_comfirm_redirect') && (! $url || $url === 'register_form.php' || (function_exists('social_is_edit_page') && social_is_edit_page($url) ) ) ){    
     social_member_comfirm_redirect();
 }
 
@@ -24,10 +24,15 @@ include_once('./_head.sub.php');
 // url 체크
 check_url_host($url, '', G5_URL, true);
 
-if( preg_match('#^/{3,}#', $url) ){
-    $url = preg_replace('#^/{3,}#', '/', $url);
+if($url){
+    $url = preg_replace('#^/\\\{1,}#', '/', $url);
+
+    if( preg_match('#^/{3,}#', $url) ){
+        $url = preg_replace('#^/{3,}#', '/', $url);
+    }
 }
 
+
 $url = get_text($url);
 
 include_once($member_skin_path.'/member_confirm.skin.php');
diff --git a/bbs/new_delete.php b/bbs/new_delete.php
index 8e3eb7b08..35d6601f6 100644
--- a/bbs/new_delete.php
+++ b/bbs/new_delete.php
@@ -128,7 +128,7 @@ for($i=0;$i<count($_POST['chk_bn_id']);$i++)
         $row = sql_fetch($sql);
 
         // 원글의 코멘트 숫자를 감소
-        sql_query(" update $write_table set wr_comment = wr_comment - 1, wr_last = '$row[wr_last]' where wr_id = '{$write['wr_parent']}' ");
+        sql_query(" update $write_table set wr_comment = wr_comment - 1, wr_last = '{$row['wr_last']}' where wr_id = '{$write['wr_parent']}' ");
 
         // 코멘트 숫자 감소
         sql_query(" update {$g5['board_table']} set bo_count_comment = bo_count_comment - 1 where bo_table = '$bo_table' ");
diff --git a/bbs/password_lost_certify.php b/bbs/password_lost_certify.php
index 5307a7197..71c0116b1 100644
--- a/bbs/password_lost_certify.php
+++ b/bbs/password_lost_certify.php
@@ -1,6 +1,9 @@
 <?php
 include_once('./_common.php');
 
+// 봇의 메일 링크 크롤링을 방지합니다.
+if(function_exists('check_mail_bot')){ check_mail_bot($_SERVER['REMOTE_ADDR']); }
+
 // 오류시 공히 Error 라고 처리하는 것은 회원정보가 있는지? 비밀번호가 틀린지? 를 알아보려는 해킹에 대비한것
 
 $mb_no = trim($_GET['mb_no']);
diff --git a/config.php b/config.php
index cdeb7baf4..76f17857e 100644
--- a/config.php
+++ b/config.php
@@ -5,7 +5,7 @@
 ********************/
 
 define('G5_VERSION', '그누보드5');
-define('G5_GNUBOARD_VER', '5.3.1.9');
+define('G5_GNUBOARD_VER', '5.3.2.2');
 
 // 이 상수가 정의되지 않으면 각각의 개별 페이지는 별도로 실행될 수 없음
 define('_GNUBOARD_', true);
diff --git a/lib/common.lib.php b/lib/common.lib.php
index dffe527cf..f673305a8 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -2990,7 +2990,17 @@ function get_search_string($stx)
 // XSS 관련 태그 제거
 function clean_xss_tags($str)
 {
-    $str = preg_replace('#</*(?:applet|b(?:ase|gsound|link)|embed|frame(?:set)?|i(?:frame|layer)|l(?:ayer|ink)|meta|object|s(?:cript|tyle)|title|xml)[^>]*+>#i', '', $str);
+    $str_len = strlen($str);
+    
+    $i = 0;
+    while($i <= $str_len){
+        $result = preg_replace('#</*(?:applet|b(?:ase|gsound|link)|embed|frame(?:set)?|i(?:frame|layer)|l(?:ayer|ink)|meta|object|s(?:cript|tyle)|title|xml)[^>]*+>#i', '', $str);
+
+        if((string)$result === (string)$str) break;
+
+        $str = $result;
+        $i++;
+    }
 
     return $str;
 }
@@ -3577,6 +3587,27 @@ function get_real_client_ip(){
     return preg_replace('/[^0-9.]/', '', $real_ip);
 }
 
+function check_mail_bot($ip=''){
+
+    //아이피를 체크하여 메일 크롤링을 방지합니다.
+    $check_ips = array('211.249.40.');
+    $bot_message = 'bot 으로 판단되어 중지합니다.';
+    
+    if($ip){
+        foreach( $check_ips as $c_ip ){
+            if( preg_match('/^'.preg_quote($c_ip).'/', $ip) ) {
+                die($bot_message);
+            }
+        }
+    }
+
+    // user agent를 체크하여 메일 크롤링을 방지합니다.
+    $user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
+    if ($user_agent === 'Carbon' || strpos($user_agent, 'BingPreview') !== false || strpos($user_agent, 'Slackbot') !== false) { 
+        die($bot_message);
+    } 
+}
+
 function get_call_func_cache($func, $args=array()){
     
     static $cache = array();
diff --git a/plugin/htmlpurifier/safeiframe.txt b/plugin/htmlpurifier/safeiframe.txt
index 48c676d4f..ab6d6444f 100644
--- a/plugin/htmlpurifier/safeiframe.txt
+++ b/plugin/htmlpurifier/safeiframe.txt
@@ -11,4 +11,5 @@ www.microsoft.com/showcase/video.aspx/
 w.soundcloud.com/
 www.facebook.com/
 kakaotv.daum.net/
-v.afree.ca/
\ No newline at end of file
+v.afree.ca/
+play-tv.kakao.com/
\ No newline at end of file
diff --git a/plugin/kcpcert/kcpcert_result.php b/plugin/kcpcert/kcpcert_result.php
index 031942fa9..5468267ae 100644
--- a/plugin/kcpcert/kcpcert_result.php
+++ b/plugin/kcpcert/kcpcert_result.php
@@ -143,7 +143,7 @@ if( $cert_enc_use == "Y" )
         $sql = " select mb_id from {$g5['member_table']} where mb_id <> '{$member['mb_id']}' and mb_dupinfo = '{$mb_dupinfo}' ";
         $row = sql_fetch($sql);
         if ($row['mb_id']) {
-            alert_close("입력하신 본인학인 정보로 가입된 내역이 존재합니다.\\n회원아이디 : ".$row['mb_id']);
+            alert_close("입력하신 본인확인 정보로 가입된 내역이 존재합니다.\\n회원아이디 : ".$row['mb_id']);
         }
 
         // hash 데이터
diff --git a/plugin/lgxpay/AuthOnlyReq.php b/plugin/lgxpay/AuthOnlyReq.php
index f8c42b1b6..571d7d9c9 100644
--- a/plugin/lgxpay/AuthOnlyReq.php
+++ b/plugin/lgxpay/AuthOnlyReq.php
@@ -165,6 +165,8 @@ $_SESSION['lgd_certify'] = $payReqMap;
 <input type="hidden" name="LGD_ENCODING" value="UTF-8"/>
 <?php
 foreach ($payReqMap as $key => $value) {
+    $key = htmlspecialchars(strip_tags($key));
+    $value = htmlspecialchars(strip_tags($value));
     echo "<input type='hidden' name='$key' id='$key' value='$value'/>".PHP_EOL;
 }
 ?>
diff --git a/plugin/lgxpay/returnurl.php b/plugin/lgxpay/returnurl.php
index e0cd0a37b..b40e8940e 100644
--- a/plugin/lgxpay/returnurl.php
+++ b/plugin/lgxpay/returnurl.php
@@ -57,6 +57,8 @@ $payReqMap = $_SESSION['lgd_certify'];//결제 요청시, Session에 저장했
 <form method="post" name="LGD_RETURNINFO" id="LGD_RETURNINFO">
 <?php
 	  foreach ($payReqMap as $key => $value) {
+        $key = htmlspecialchars(strip_tags($key));
+        $value = htmlspecialchars(strip_tags($value));
       echo "<input type='hidden' name='$key' id='$key' value='$value'>";
     }
 ?>
diff --git a/plugin/social/includes/functions.php b/plugin/social/includes/functions.php
index 4b847f54d..fab949a88 100644
--- a/plugin/social/includes/functions.php
+++ b/plugin/social/includes/functions.php
@@ -52,6 +52,10 @@ function get_social_callbackurl($provider, $no_domain=false){
         $base_url = '/'.ltrim(parse_url($base_url, PHP_URL_PATH), '/');
     }
 
+    if ( $provider === 'twitter' ){
+        return $base_url;
+    }
+
     $base_url = $base_url . ( strpos($base_url, '?') ? '&' : '?' ).G5_SOCIAL_LOGIN_DONE_PARAM.'='.$provider;
 
     return $base_url;
@@ -764,6 +768,23 @@ function social_member_comfirm_redirect(){
     }
 }
 
+function social_is_edit_page($url=''){
+    global $is_member;
+
+    if( !$is_member ) return false;
+
+    if($url){
+        $p = @parse_url($url);
+        $host = preg_replace('/:[0-9]+$/', '', $_SERVER['HTTP_HOST']);
+
+        if ( isset($p['host']) && ($p['host'] === $host) && preg_match('/register_form\.php$/i', $url) ){
+            return true;
+        }
+    }
+
+    return false;
+}
+
 function social_is_login_password_check($mb_id){
     global $g5;
 
diff --git a/skin/board/basic/style.css b/skin/board/basic/style.css
index 37bf7fab7..d85f02315 100644
--- a/skin/board/basic/style.css
+++ b/skin/board/basic/style.css
@@ -65,7 +65,7 @@
 #bo_w .tbl_frm01 {}
 #bo_w .tbl_frm01 th {}
 #bo_w .tbl_frm01 td {}
-#bo_w .tbl_frm01 textarea, #bo_w tbl_frm01 .frm_input {}
+#bo_w .tbl_frm01 textarea, #bo_w .tbl_frm01 .frm_input {}
 #bo_w .tbl_frm01 textarea {}
 /*
 #bo_w .tbl_frm01 #captcha {}
diff --git a/skin/board/gallery/style.css b/skin/board/gallery/style.css
index 7dd98d16b..cb38ea31f 100644
--- a/skin/board/gallery/style.css
+++ b/skin/board/gallery/style.css
@@ -55,7 +55,7 @@
 #bo_w .tbl_frm01 {}
 #bo_w .tbl_frm01 th {}
 #bo_w .tbl_frm01 td {}
-#bo_w .tbl_frm01 textarea, #bo_w tbl_frm01 .frm_input {}
+#bo_w .tbl_frm01 textarea, #bo_w .tbl_frm01 .frm_input {}
 #bo_w .tbl_frm01 textarea {}
 /*
 #bo_w .tbl_frm01 #captcha {}
diff --git a/theme/basic/skin/board/basic/style.css b/theme/basic/skin/board/basic/style.css
index 37bf7fab7..d85f02315 100644
--- a/theme/basic/skin/board/basic/style.css
+++ b/theme/basic/skin/board/basic/style.css
@@ -65,7 +65,7 @@
 #bo_w .tbl_frm01 {}
 #bo_w .tbl_frm01 th {}
 #bo_w .tbl_frm01 td {}
-#bo_w .tbl_frm01 textarea, #bo_w tbl_frm01 .frm_input {}
+#bo_w .tbl_frm01 textarea, #bo_w .tbl_frm01 .frm_input {}
 #bo_w .tbl_frm01 textarea {}
 /*
 #bo_w .tbl_frm01 #captcha {}
diff --git a/theme/basic/skin/board/gallery/style.css b/theme/basic/skin/board/gallery/style.css
index e20ab1c66..035553804 100644
--- a/theme/basic/skin/board/gallery/style.css
+++ b/theme/basic/skin/board/gallery/style.css
@@ -55,7 +55,7 @@
 #bo_w .tbl_frm01 {}
 #bo_w .tbl_frm01 th {}
 #bo_w .tbl_frm01 td {}
-#bo_w .tbl_frm01 textarea, #bo_w tbl_frm01 .frm_input {}
+#bo_w .tbl_frm01 textarea, #bo_w .tbl_frm01 .frm_input {}
 #bo_w .tbl_frm01 textarea {}
 /*
 #bo_w .tbl_frm01 #captcha {}