diff --git a/adm/board_form_update.php b/adm/board_form_update.php
index 912887760..2222baadb 100644
--- a/adm/board_form_update.php
+++ b/adm/board_form_update.php
@@ -72,6 +72,9 @@ $bo_category_list = str_replace($src_char, $dst_char, $bo_category_list);
 //https://github.com/gnuboard/gnuboard5/commit/f5f4925d4eb28ba1af728e1065fc2bdd9ce1da58 에 따른 조치
 $str_bo_category_list = isset($_POST['bo_category_list']) ? preg_replace("/[\<\>\'\"\\\'\\\"\%\=\(\)\/\^\*]/", "", $_POST['bo_category_list']) : '';
 
+$_POST['bo_subject'] = strip_tags($_POST['bo_subject']);
+$_POST['bo_mobile_subject'] = strip_tags($_POST['bo_mobile_subject']);
+
 $sql_common = " gr_id               = '{$_POST['gr_id']}',
                 bo_subject          = '{$_POST['bo_subject']}',
                 bo_mobile_subject   = '{$_POST['bo_mobile_subject']}',
diff --git a/adm/boardgroup_form.php b/adm/boardgroup_form.php
index 73e162d98..c9e8338bd 100644
--- a/adm/boardgroup_form.php
+++ b/adm/boardgroup_form.php
@@ -117,7 +117,7 @@ include_once('./admin.head.php');
             <label for="gr_<?php echo $i ?>_subj">여분필드 <?php echo $i ?> 제목</label>
             <input type="text" name="gr_<?php echo $i ?>_subj" value="<?php echo get_text($group['gr_'.$i.'_subj']) ?>" id="gr_<?php echo $i ?>_subj" class="frm_input">
             <label for="gr_<?php echo $i ?>">여분필드 <?php echo $i ?> 내용</label>
-            <input type="text" name="gr_<?php echo $i ?>" value="<?php echo $gr['gr_'.$i] ?>" id="gr_<?php echo $i ?>" class="frm_input">
+            <input type="text" name="gr_<?php echo $i ?>" value="<?php echo get_sanitize_input($gr['gr_'.$i]); ?>" id="gr_<?php echo $i ?>" class="frm_input">
         </td>
     </tr>
     <?php } ?>
diff --git a/adm/config_form.php b/adm/config_form.php
index 00915fe7d..e4daee961 100644
--- a/adm/config_form.php
+++ b/adm/config_form.php
@@ -1317,7 +1317,7 @@ if ($config['cf_sms_use'] && $config['cf_icode_id'] && $config['cf_icode_pw']) {
                 <label for="cf_<?php echo $i ?>_subj">여분필드<?php echo $i ?> 제목</label>
                 <input type="text" name="cf_<?php echo $i ?>_subj" value="<?php echo get_text($config['cf_'.$i.'_subj']) ?>" id="cf_<?php echo $i ?>_subj" class="frm_input" size="30">
                 <label for="cf_<?php echo $i ?>">여분필드<?php echo $i ?> 값</label>
-                <input type="text" name="cf_<?php echo $i ?>" value="<?php echo $config['cf_'.$i] ?>" id="cf_<?php echo $i ?>" class="frm_input" size="30">
+                <input type="text" name="cf_<?php echo $i ?>" value="<?php echo get_sanitize_input($config['cf_'.$i]); ?>" id="cf_<?php echo $i ?>" class="frm_input" size="30">
             </td>
         </tr>
         <?php } ?>
diff --git a/adm/config_form_update.php b/adm/config_form_update.php
index 03179c345..126786382 100644
--- a/adm/config_form_update.php
+++ b/adm/config_form_update.php
@@ -26,6 +26,8 @@ if(!$_POST['cf_cert_use']) {
 
 $cf_social_servicelist = !empty($_POST['cf_social_servicelist']) ? implode(',', $_POST['cf_social_servicelist']) : '';
 
+$_POST['cf_title'] = strip_tags($_POST['cf_title']);
+
 $sql = " update {$g5['config_table']}
             set cf_title = '{$_POST['cf_title']}',
                 cf_admin = '{$_POST['cf_admin']}',
diff --git a/adm/contentformupdate.php b/adm/contentformupdate.php
index dff780a39..69f82f0b0 100644
--- a/adm/contentformupdate.php
+++ b/adm/contentformupdate.php
@@ -20,6 +20,7 @@ if ($w == "" || $w == "u")
     $co_row = sql_fetch($sql);
 }
 
+$co_id = preg_replace('/[^a-z0-9_]/i', '', $co_id);
 $co_subject = strip_tags($co_subject);
 $co_include_head = preg_replace(array("#[\\\]+$#", "#(<\?php|<\?)#i"), "", substr($co_include_head, 0, 255));
 $co_include_tail = preg_replace(array("#[\\\]+$#", "#(<\?php|<\?)#i"), "", substr($co_include_tail, 0, 255));
@@ -59,12 +60,12 @@ if( $co_include_tail ){
     }
 }
 
-if( $co_include_head && ! is_include_path_check($co_include_head) ){
+if( $co_include_head && ! is_include_path_check($co_include_head, 1) ){
     $co_include_head = '';
     $error_msg = '/data/file/ 또는 /data/editor/ 포함된 문자를 상단 파일 경로에 포함시킬수 없습니다.';
 }
 
-if( $co_include_tail && ! is_include_path_check($co_include_tail) ){
+if( $co_include_tail && ! is_include_path_check($co_include_tail, 1) ){
     $co_include_tail = '';
     $error_msg = '/data/file/ 또는 /data/editor/ 포함된 문자를 하단 파일 경로에 포함시킬수 없습니다.';
 }
diff --git a/adm/menu_list.php b/adm/menu_list.php
index ffe88aee7..4a6c25127 100644
--- a/adm/menu_list.php
+++ b/adm/menu_list.php
@@ -196,6 +196,20 @@ function base_convert(number, frombase, tobase) {
 
 function fmenulist_submit(f)
 {
+
+    var me_links = document.getElementsByName('me_link[]');
+    var reg = /^javascript/; 
+
+	for (i=0; i<me_links.length; i++){
+        
+	    if( reg.test(me_links[i].value) ){ 
+        
+            alert('링크에 자바스크립트문을 입력할수 없습니다.');
+            me_links[i].focus();
+            return false;
+        }
+    }
+
     return true;
 }
 </script>
diff --git a/adm/menu_list_update.php b/adm/menu_list_update.php
index f05e2ec22..4244d3343 100644
--- a/adm/menu_list_update.php
+++ b/adm/menu_list_update.php
@@ -23,8 +23,8 @@ for ($i=0; $i<$count; $i++)
 
     $code    = $_POST['code'][$i];
     $me_name = $_POST['me_name'][$i];
-    $me_link = $_POST['me_link'][$i];
-
+    $me_link = preg_match('/^javascript/', $_POST['me_link'][$i]) ? G5_URL : strip_tags($_POST['me_link'][$i]);
+    
     if(!$code || !$me_name || !$me_link)
         continue;
 
diff --git a/bbs/board_head.php b/bbs/board_head.php
index 04b60450f..a62706a28 100644
--- a/bbs/board_head.php
+++ b/bbs/board_head.php
@@ -5,13 +5,13 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
 if (G5_IS_MOBILE) {
     // 모바일의 경우 설정을 따르지 않는다.
     include_once(G5_BBS_PATH.'/_head.php');
-    echo stripslashes($board['bo_mobile_content_head']);
+    echo html_purifier(stripslashes($board['bo_mobile_content_head']));
 } else {
     if(is_include_path_check($board['bo_include_head'])) {  //파일경로 체크
         @include ($board['bo_include_head']);
     } else {    //파일경로가 올바르지 않으면 기본파일을 가져옴
         include_once(G5_BBS_PATH.'/_head.php');
     }
-    echo stripslashes($board['bo_content_head']);
+    echo html_purifier(stripslashes($board['bo_content_head']));
 }
 ?>
\ No newline at end of file
diff --git a/bbs/board_tail.php b/bbs/board_tail.php
index 57b81b46e..436e2cc3b 100644
--- a/bbs/board_tail.php
+++ b/bbs/board_tail.php
@@ -3,11 +3,11 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
 
 // 게시판 관리의 하단 파일 경로
 if (G5_IS_MOBILE) {
-    echo stripslashes($board['bo_mobile_content_tail']);
+    echo html_purifier(stripslashes($board['bo_mobile_content_tail']));
     // 모바일의 경우 설정을 따르지 않는다.
     include_once(G5_BBS_PATH.'/_tail.php');
 } else {
-    echo stripslashes($board['bo_content_tail']);
+    echo html_purifier(stripslashes($board['bo_content_tail']));
     if(is_include_path_check($board['bo_include_tail'])) {  //파일경로 체크
         @include ($board['bo_include_tail']);
     } else {    //파일경로가 올바르지 않으면 기본파일을 가져옴
diff --git a/bbs/content.php b/bbs/content.php
index f9551ed80..366e11e54 100644
--- a/bbs/content.php
+++ b/bbs/content.php
@@ -1,6 +1,8 @@
 <?php
 include_once('./_common.php');
 
+$co_id = preg_replace('/[^a-z0-9_]/i', '', $co_id);
+
 //dbconfig파일에 $g5['content_table'] 배열변수가 있는지 체크
 if( !isset($g5['content_table']) ){
     die('<meta charset="utf-8">관리자 모드에서 게시판관리->내용 관리를 먼저 확인해 주세요.');
diff --git a/bbs/member_confirm.php b/bbs/member_confirm.php
index 685dec86c..722a78302 100644
--- a/bbs/member_confirm.php
+++ b/bbs/member_confirm.php
@@ -11,16 +11,16 @@ else
     $urlencode = urlencode($_SERVER[REQUEST_URI]);
 */
 
+$url = clean_xss_tags($_GET['url']);
+
 //소셜 로그인 한 경우
-if( function_exists('social_member_comfirm_redirect') ){    
+if( function_exists('social_member_comfirm_redirect') && (! $url || $url === 'register_form.php') ){    
     social_member_comfirm_redirect();
 }
 
 $g5['title'] = '회원 비밀번호 확인';
 include_once('./_head.sub.php');
 
-$url = clean_xss_tags($_GET['url']);
-
 // url 체크
 check_url_host($url, '', G5_URL, true);
 
diff --git a/bbs/password.php b/bbs/password.php
index e5e0a4d4e..646f3b645 100644
--- a/bbs/password.php
+++ b/bbs/password.php
@@ -43,8 +43,8 @@ switch ($w) {
 
 include_once(G5_PATH.'/head.sub.php');
 
-//if ($board['bo_include_head']) { @include ($board['bo_include_head']); }
-//if ($board['bo_content_head']) { echo stripslashes($board['bo_content_head']); }
+//if ($board['bo_include_head'] && is_include_path_check($board['bo_content_head'])) { @include ($board['bo_include_head']); }
+//if ($board['bo_content_head']) { echo html_purifier(stripslashes($board['bo_content_head'])); }
 
 /* 비밀글의 제목을 가져옴 지운아빠 2013-01-29 */
 $sql = " select wr_subject from {$write_table}
@@ -57,8 +57,8 @@ $g5['title'] = get_text($row['wr_subject']);
 
 include_once($member_skin_path.'/password.skin.php');
 
-//if ($board['bo_content_tail']) { echo stripslashes($board['bo_content_tail']); }
-//if ($board['bo_include_tail']) { @include ($board['bo_include_tail']); }
+//if ($board['bo_content_tail']) { echo html_purifier(stripslashes($board['bo_content_tail'])); }
+//if ($board['bo_include_tail'] && is_include_path_check($board['bo_content_tail'])) { @include ($board['bo_include_tail']); }
 
 include_once(G5_PATH.'/tail.sub.php');
 ?>
diff --git a/bbs/view_image.php b/bbs/view_image.php
index 779f83a30..196df9f4c 100644
--- a/bbs/view_image.php
+++ b/bbs/view_image.php
@@ -4,8 +4,13 @@ include_once('./_common.php');
 $g5['title'] = '이미지 크게보기';
 include_once(G5_PATH.'/head.sub.php');
 
-$filename = $_GET['fn'];
-$bo_table = $_GET['bo_table'];
+$filename = preg_replace('/[^A-Za-z0-9 _ .\-\/]/', '', $_GET['fn']);
+
+$extension = pathinfo($filename, PATHINFO_EXTENSION);
+
+if ( ! preg_match('/(jpg|jpeg|png|gif|bmp)$/i', $extension) ){
+    alert_close('이미지 확장자가 아닙니다.');
+}
 
 if(strpos($filename, 'data/editor')) {
     $editor_file = strstr($filename, 'editor');
diff --git a/config.php b/config.php
index 6d69fe466..16e566c5c 100644
--- a/config.php
+++ b/config.php
@@ -5,7 +5,7 @@
 ********************/
 
 define('G5_VERSION', '그누보드5');
-define('G5_GNUBOARD_VER', '5.3.1.8');
+define('G5_GNUBOARD_VER', '5.3.1.9');
 
 // 이 상수가 정의되지 않으면 각각의 개별 페이지는 별도로 실행될 수 없음
 define('_GNUBOARD_', true);
diff --git a/g4_import_run.php b/g4_import_run.php
index 259832777..6681df0e8 100644
--- a/g4_import_run.php
+++ b/g4_import_run.php
@@ -71,6 +71,7 @@ document.onkeydown = noRefresh ;
 <?php
 flush();
 
+$g4 = array();
 // g4의 confing.php
 require('./'.$g4_config_file);
 
diff --git a/js/certify.js b/js/certify.js
index d98c59785..bcf4f9ed8 100644
--- a/js/certify.js
+++ b/js/certify.js
@@ -1,6 +1,11 @@
 // 본인확인 인증창 호출
-function certify_win_open(type, url)
+function certify_win_open(type, url, event)
 {
+
+    if (typeof event == "undefined") {
+        event = window.event;
+    }
+
     if(type == 'kcb-ipin')
     {
         var popupWindow = window.open( url, "kcbPop", "left=200, top=100, status=0, width=450, height=550" );
diff --git a/lib/common.lib.php b/lib/common.lib.php
index b4ec2c59a..2154bf7e2 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -2072,12 +2072,20 @@ function abs_ip2long($ip='')
 
 function get_selected($field, $value)
 {
+    if( is_int($value) ){
+        return ((int) $field===$value) ? ' selected="selected"' : '';
+    }
+
     return ($field===$value) ? ' selected="selected"' : '';
 }
 
 
 function get_checked($field, $value)
 {
+    if( is_int($value) ){
+        return ((int) $field===$value) ? ' checked="checked"' : '';
+    }
+
     return ($field===$value) ? ' checked="checked"' : '';
 }
 
@@ -3449,10 +3457,13 @@ function is_use_email_certify(){
 
 function get_real_client_ip(){
 
-    if(isset($_SERVER['HTTP_X_FORWARDED_FOR']))
-        return $_SERVER['HTTP_X_FORWARDED_FOR'];
+    $real_ip = $_SERVER['REMOTE_ADDR'];
 
-    return $_SERVER['REMOTE_ADDR'];
+    if(isset($_SERVER['HTTP_X_FORWARDED_FOR']) && preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\z/', $_SERVER['HTTP_X_FORWARDED_FOR']) ){
+        $real_ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
+    }
+
+    return preg_replace('/[^0-9.]/', '', $real_ip);
 }
 
 function get_call_func_cache($func, $args=array()){
diff --git a/mobile/skin/member/basic/register_form.skin.php b/mobile/skin/member/basic/register_form.skin.php
index 7719e0deb..bcd18bfd5 100644
--- a/mobile/skin/member/basic/register_form.skin.php
+++ b/mobile/skin/member/basic/register_form.skin.php
@@ -52,7 +52,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
             if($config['cf_cert_use']) {
                 if($config['cf_cert_ipin'])
                     echo '<button type="button" id="win_ipin_cert" class="btn_frmline btn">아이핀 본인확인</button>'.PHP_EOL;
-                if($config['cf_cert_hp'] && $config['cf_cert_hp'] != 'lg')
+                if($config['cf_cert_hp'])
                     echo '<button type="button" id="win_hp_cert" class="btn_frmline btn">휴대폰 본인확인</button>'.PHP_EOL;
 
                 echo '<noscript>본인확인을 위해서는 자바스크립트 사용이 가능해야합니다.</noscript>'.PHP_EOL;
@@ -106,7 +106,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
         <?php if ($config['cf_use_homepage']) { ?>
         <li>
             <label for="reg_mb_homepage" class="sound_only">홈페이지<?php if ($config['cf_req_homepage']){ ?><strong>필수</strong><?php } ?></label>
-            <input type="url" name="mb_homepage" value="<?php echo get_text($member['mb_homepage']) ?>" id="reg_mb_homepage" class="frm_input full_input <?php echo $config['cf_req_homepage']?"required":""; ?>" maxlength="255" <?php echo $config['cf_req_homepage']?"required":""; ?> placeholder="홈페이지">
+            <input type="text" name="mb_homepage" value="<?php echo get_text($member['mb_homepage']) ?>" id="reg_mb_homepage" class="frm_input full_input <?php echo $config['cf_req_homepage']?"required":""; ?>" maxlength="255" <?php echo $config['cf_req_homepage']?"required":""; ?> placeholder="홈페이지">
         </li>
         <?php } ?>
 
@@ -272,19 +272,19 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
 
         <?php if($config['cf_cert_use'] && $config['cf_cert_ipin']) { ?>
         // 아이핀인증
-        $("#win_ipin_cert").click(function() {
+        $("#win_ipin_cert").click(function(e) {
             if(!cert_confirm())
                 return false;
 
             var url = "<?php echo G5_OKNAME_URL; ?>/ipin1.php";
-            certify_win_open('kcb-ipin', url);
+            certify_win_open('kcb-ipin', url, e);
             return;
         });
 
         <?php } ?>
         <?php if($config['cf_cert_use'] && $config['cf_cert_hp']) { ?>
         // 휴대폰인증
-        $("#win_hp_cert").click(function() {
+        $("#win_hp_cert").click(function(e) {
             if(!cert_confirm())
                 return false;
 
@@ -298,6 +298,10 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
                     $cert_url = G5_KCPCERT_URL.'/kcpcert_form.php';
                     $cert_type = 'kcp-hp';
                     break;
+                case 'lg':
+                    $cert_url = G5_LGXPAY_URL.'/AuthOnlyReq.php';
+                    $cert_type = 'lg-hp';
+                    break;
                 default:
                     echo 'alert("기본환경설정에서 휴대폰 본인확인 설정을 해주십시오");';
                     echo 'return false;';
@@ -305,7 +309,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
             }
             ?>
 
-            certify_win_open("<?php echo $cert_type; ?>", "<?php echo $cert_url; ?>");
+            certify_win_open("<?php echo $cert_type; ?>", "<?php echo $cert_url; ?>", e);
             return;
         });
         <?php } ?>
diff --git a/plugin/okname/ipin1.php b/plugin/okname/ipin1.php
index 864995786..f448c216d 100644
--- a/plugin/okname/ipin1.php
+++ b/plugin/okname/ipin1.php
@@ -4,7 +4,9 @@ include_once('./_common.php');
 // 금일 인증시도 회수 체크
 certify_count_check($member['mb_id'], 'ipin');
 
-include_once('./ipin.config.php');
+// KISA 취약점 내용(KVE-2018-0291) hpcert1.php의 $cmd 함수에 대한 인자 값은 hpcert_config.php 파일에서 설정되나, 이를 다른 페이지에서 포함한 뒤 호출할 시 임의 값 설정 가능
+// 이에 include_once 를 include 로 수정함
+include('./ipin.config.php');
 
 $option = "C";// Option
 
diff --git a/theme/basic/mobile/skin/member/basic/register_form.skin.php b/theme/basic/mobile/skin/member/basic/register_form.skin.php
index 3e11894c1..6f9137059 100644
--- a/theme/basic/mobile/skin/member/basic/register_form.skin.php
+++ b/theme/basic/mobile/skin/member/basic/register_form.skin.php
@@ -52,7 +52,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
             if($config['cf_cert_use']) {
                 if($config['cf_cert_ipin'])
                     echo '<button type="button" id="win_ipin_cert" class="btn_frmline btn">아이핀 본인확인</button>'.PHP_EOL;
-                if($config['cf_cert_hp'] && $config['cf_cert_hp'] != 'lg')
+                if($config['cf_cert_hp'])
                     echo '<button type="button" id="win_hp_cert" class="btn_frmline btn">휴대폰 본인확인</button>'.PHP_EOL;
 
                 echo '<noscript>본인확인을 위해서는 자바스크립트 사용이 가능해야합니다.</noscript>'.PHP_EOL;
@@ -106,7 +106,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
         <?php if ($config['cf_use_homepage']) { ?>
         <li>
             <label for="reg_mb_homepage" class="sound_only">홈페이지<?php if ($config['cf_req_homepage']){ ?><strong>필수</strong><?php } ?></label>
-            <input type="url" name="mb_homepage" value="<?php echo get_text($member['mb_homepage']) ?>" id="reg_mb_homepage" class="frm_input full_input <?php echo $config['cf_req_homepage']?"required":""; ?>" maxlength="255" <?php echo $config['cf_req_homepage']?"required":""; ?> placeholder="홈페이지">
+            <input type="text" name="mb_homepage" value="<?php echo get_text($member['mb_homepage']) ?>" id="reg_mb_homepage" class="frm_input full_input <?php echo $config['cf_req_homepage']?"required":""; ?>" maxlength="255" <?php echo $config['cf_req_homepage']?"required":""; ?> placeholder="홈페이지">
         </li>
         <?php } ?>
 
@@ -272,19 +272,19 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
 
         <?php if($config['cf_cert_use'] && $config['cf_cert_ipin']) { ?>
         // 아이핀인증
-        $("#win_ipin_cert").click(function() {
+        $("#win_ipin_cert").click(function(e) {
             if(!cert_confirm())
                 return false;
 
             var url = "<?php echo G5_OKNAME_URL; ?>/ipin1.php";
-            certify_win_open('kcb-ipin', url);
+            certify_win_open('kcb-ipin', url, e);
             return;
         });
 
         <?php } ?>
         <?php if($config['cf_cert_use'] && $config['cf_cert_hp']) { ?>
         // 휴대폰인증
-        $("#win_hp_cert").click(function() {
+        $("#win_hp_cert").click(function(e) {
             if(!cert_confirm())
                 return false;
 
@@ -298,6 +298,10 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
                     $cert_url = G5_KCPCERT_URL.'/kcpcert_form.php';
                     $cert_type = 'kcp-hp';
                     break;
+                case 'lg':
+                    $cert_url = G5_LGXPAY_URL.'/AuthOnlyReq.php';
+                    $cert_type = 'lg-hp';
+                    break;
                 default:
                     echo 'alert("기본환경설정에서 휴대폰 본인확인 설정을 해주십시오");';
                     echo 'return false;';
@@ -305,7 +309,7 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
             }
             ?>
 
-            certify_win_open("<?php echo $cert_type; ?>", "<?php echo $cert_url; ?>");
+            certify_win_open("<?php echo $cert_type; ?>", "<?php echo $cert_url; ?>", e);
             return;
         });
         <?php } ?>