diff --git a/scripts/install b/scripts/install
index ee24abe..c57b44e 100644
--- a/scripts/install
+++ b/scripts/install
@@ -170,6 +170,11 @@ lastid=$(mysql -u$db_user -p$db_pwd $db_name -BN -e "SELECT max(id) from \`users
 lastid=$(($lastid + 1 ))
 mysql -u$db_user -p$db_pwd $db_name -e "INSERT INTO \`users_groups\` (\`id\` , \`usrgrpid\`, \`userid\`) VALUES ($lastid ,9, 1);"
 
+#disable default guest 
+lastid=$(mysql -u$db_user -p$db_pwd $db_name -BN -e "SELECT max(id) from \`users_groups\`")
+lastid=$(($lastid + 1 ))
+mysql -u$db_user -p$db_pwd $db_name -e "INSERT INTO \`users_groups\` (\`id\` , \`usrgrpid\`, \`userid\`) VALUES ($lastid ,9, 2);"
+
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index e3c7182..ab2d3a8 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -66,6 +66,21 @@ else
     echo "default admin already disabled"
 fi
 
+#=================================================
+# Disable default guest for security issue
+#=================================================
+haveDefaultGuestDisabled=$(mysql -BN -u$db_user -p$db_pwd $db_name -BN -e "SELECT count(id) from \`users_groups\` where userid=2 and usrgrpid=9")
+
+if [ "$haveDefaultGuestDisabled" -eq 0 ] ;then
+    echo "Disable default guest"
+    #disable default guest 
+    lastid=$(mysql -u$db_user -p$db_pwd $db_name -BN -e "SELECT max(id) from \`users_groups\`")
+    lastid=$(($lastid + 1 ))
+    mysql -u$db_user -p$db_pwd $db_name -e "INSERT INTO \`users_groups\` (\`id\` , \`usrgrpid\`, \`userid\`) VALUES ($lastid ,9, 2);"
+else
+    echo "default guest already disabled"
+fi
+
 #=================================================
 # CHECK THE PATH
 #=================================================