diff --git a/js/certify.js b/js/certify.js
index 2c3eb2c8b..a28e55526 100644
--- a/js/certify.js
+++ b/js/certify.js
@@ -19,7 +19,10 @@ function certify_win_open(type, url, event) {
         if($("input[name=veri_up_hash]").length < 1)
                 $("input[name=cert_no]").after('<input type="hidden" name="veri_up_hash" value="">');
 
-        if( navigator.userAgent.indexOf("Android") > - 1 || navigator.userAgent.indexOf("iPhone") > - 1 )
+        // iframe에서 세션공유 문제가 있어서 더 이상 iframe 을 사용하지 않습니다.
+        var use_iframe = false;
+
+        if(use_iframe && (navigator.userAgent.indexOf("Android") > - 1 || navigator.userAgent.indexOf("iPhone") > - 1))
         {
             var $frm = $(event.target.form);
 
diff --git a/mobile/skin/member/basic/password_lost.skin.php b/mobile/skin/member/basic/password_lost.skin.php
index e9e40bcd8..f33b720c9 100644
--- a/mobile/skin/member/basic/password_lost.skin.php
+++ b/mobile/skin/member/basic/password_lost.skin.php
@@ -12,6 +12,7 @@ if($config['cf_cert_use'] && ($config['cf_cert_simple'] || $config['cf_cert_ipin
 <div id="find_info" class="new_win<?php if($config['cf_cert_use'] != 0 && $config['cf_cert_find'] != 0) { ?> cert<?php } ?>">
     <div class="new_win_con">
         <form name="fpasswordlost" action="<?php echo $action_url ?>" onsubmit="return fpasswordlost_submit(this);" method="post" autocomplete="off">
+        <input type="hidden" name="cert_no" value="">
         <h3>이메일로 찾기</h3>
         <fieldset id="info_fs">
             <p>
diff --git a/plugin/kcpcert/find_kcpcert_result.php b/plugin/kcpcert/find_kcpcert_result.php
index a882cbb82..0b3f78a02 100644
--- a/plugin/kcpcert/find_kcpcert_result.php
+++ b/plugin/kcpcert/find_kcpcert_result.php
@@ -211,14 +211,17 @@ $ct_cert->mf_clear();
         
         var $opener = window.opener;
         var is_mobile = false;        
-        $opener.name="parentPage";       
+        $opener.name="parentPage";
 
+        // 안드로이드 웹뷰에서 거의 다 새창을 지원하므로 더 이상 iframe 을 사용하지 않습니다.
+        /*
         if (typeof g5_is_mobile != "undefined" && g5_is_mobile ) {
             $opener = window.parent;
             is_mobile = true;
         } else {
             $opener = window.opener;
         }
+        */
         
         // up_hash 검증
         if( document.mbFindForm.up_hash.value != $opener.$("input[name=veri_up_hash]").val() ) {
diff --git a/plugin/kcpcert/kcpcert_form.php b/plugin/kcpcert/kcpcert_form.php
index 628f70a79..400c0e3a5 100644
--- a/plugin/kcpcert/kcpcert_form.php
+++ b/plugin/kcpcert/kcpcert_form.php
@@ -116,17 +116,17 @@ window.onload = function() {
 function cert_page()
 {
     var frm = document.form_auth;
+    // iframe에서 세션공유 문제가 있어서 더 이상 iframe 을 사용하지 않습니다.
+    var use_iframe = false;
 
     if ( ( frm.req_tx.value == "auth" || frm.req_tx.value == "otp_auth" ) )
     {
         frm.action=".<?php echo $resultPage; ?>";
 
-       // MOBILE
-        if( ( navigator.userAgent.indexOf("Android") > - 1 || navigator.userAgent.indexOf("iPhone") > - 1 ) )
+        if(use_iframe && ( navigator.userAgent.indexOf("Android") > - 1 || navigator.userAgent.indexOf("iPhone") > - 1 ) )
         {
             self.name="kcp_cert";
         }
-        // PC
         else
         {
             frm.target="kcp_cert";
@@ -139,12 +139,12 @@ function cert_page()
 
     else if ( frm.req_tx.value == "cert" )
     {
-        if( ( navigator.userAgent.indexOf("Android") > - 1 || navigator.userAgent.indexOf("iPhone") > - 1 ) ) // 스마트폰인 경우
+        if(use_iframe && ( navigator.userAgent.indexOf("Android") > - 1 || navigator.userAgent.indexOf("iPhone") > - 1 ) )
         {
             window.parent.$("input[name=veri_up_hash]").val(frm.up_hash.value); // up_hash 데이터 검증을 위한 필드
             self.name="auth_popup";
         }
-        else // 스마트폰 아닐때
+        else
         {
             window.opener.$("input[name=veri_up_hash]").val(frm.up_hash.value); // up_hash 데이터 검증을 위한 필드
             frm.target = "auth_popup";
diff --git a/plugin/kcpcert/kcpcert_result.php b/plugin/kcpcert/kcpcert_result.php
index 2b8816327..20828257c 100644
--- a/plugin/kcpcert/kcpcert_result.php
+++ b/plugin/kcpcert/kcpcert_result.php
@@ -211,8 +211,10 @@ $ct_cert->mf_clear();
 $(function() {
     var $opener;
     var is_mobile = false;
+    // iframe에서 세션공유 문제가 있어서 더 이상 iframe 을 사용하지 않습니다.
+    var use_iframe = false;
 
-    if( ( navigator.userAgent.indexOf("Android") > - 1 || navigator.userAgent.indexOf("iPhone") > - 1 ) ) { // 스마트폰인 경우
+    if(use_iframe && ( navigator.userAgent.indexOf("Android") > - 1 || navigator.userAgent.indexOf("iPhone") > - 1 ) ) {
         $opener = window.parent;
         is_mobile = true;
     } else {
diff --git a/skin/member/basic/password_lost.skin.php b/skin/member/basic/password_lost.skin.php
index 97fc852cb..04f12ce71 100644
--- a/skin/member/basic/password_lost.skin.php
+++ b/skin/member/basic/password_lost.skin.php
@@ -12,6 +12,7 @@ if($config['cf_cert_use'] && ($config['cf_cert_simple'] || $config['cf_cert_ipin
 <div id="find_info" class="new_win<?php if($config['cf_cert_use'] != 0 && $config['cf_cert_find'] != 0) { ?> cert<?php } ?>">
     <div class="new_win_con">
         <form name="fpasswordlost" action="<?php echo $action_url ?>" onsubmit="return fpasswordlost_submit(this);" method="post" autocomplete="off">
+        <input type="hidden" name="cert_no" value="">
         <h3>이메일로 찾기</h3>
         <fieldset id="info_fs">
             <p>
diff --git a/theme/basic/mobile/skin/member/basic/password_lost.skin.php b/theme/basic/mobile/skin/member/basic/password_lost.skin.php
index 97fc852cb..04f12ce71 100644
--- a/theme/basic/mobile/skin/member/basic/password_lost.skin.php
+++ b/theme/basic/mobile/skin/member/basic/password_lost.skin.php
@@ -12,6 +12,7 @@ if($config['cf_cert_use'] && ($config['cf_cert_simple'] || $config['cf_cert_ipin
 <div id="find_info" class="new_win<?php if($config['cf_cert_use'] != 0 && $config['cf_cert_find'] != 0) { ?> cert<?php } ?>">
     <div class="new_win_con">
         <form name="fpasswordlost" action="<?php echo $action_url ?>" onsubmit="return fpasswordlost_submit(this);" method="post" autocomplete="off">
+        <input type="hidden" name="cert_no" value="">
         <h3>이메일로 찾기</h3>
         <fieldset id="info_fs">
             <p>
diff --git a/theme/basic/skin/member/basic/password_lost.skin.php b/theme/basic/skin/member/basic/password_lost.skin.php
index 97fc852cb..04f12ce71 100644
--- a/theme/basic/skin/member/basic/password_lost.skin.php
+++ b/theme/basic/skin/member/basic/password_lost.skin.php
@@ -12,6 +12,7 @@ if($config['cf_cert_use'] && ($config['cf_cert_simple'] || $config['cf_cert_ipin
 <div id="find_info" class="new_win<?php if($config['cf_cert_use'] != 0 && $config['cf_cert_find'] != 0) { ?> cert<?php } ?>">
     <div class="new_win_con">
         <form name="fpasswordlost" action="<?php echo $action_url ?>" onsubmit="return fpasswordlost_submit(this);" method="post" autocomplete="off">
+        <input type="hidden" name="cert_no" value="">
         <h3>이메일로 찾기</h3>
         <fieldset id="info_fs">
             <p>