这个PHP代码是否有安全漏洞？

define ( 'CURRENT_TIME',time ()); / / Current time. 
define ( 'ONLINE_TIME_MIN',(CURRENT_TIME - BOTNET_TIMEOUT)); / / Minimum time for the status of "Online". 
define ( 'DEFAULT_LANGUAGE','en'); / / Default language. 
define ( 'THEME_PATH','theme'); / / folder for the theme. 

/ / HTTP requests. 
define ( 'QUERY_SCRIPT',basename ($_SERVER [ 'PHP_SELF'])); 
define ( 'QUERY_SCRIPT_HTML',QUERY_SCRIPT); 
define ( 'QUERY_VAR_MODULE','m'); / / variable contains the current module. 
define ( 'QUERY_STRING_BLANK',QUERY_SCRIPT. '? m ='); / / An empty query string. 
define ( 'QUERY_STRING_BLANK_HTML',QUERY_SCRIPT_HTML. '? m ='); / / Empty query string in HTML. 
define ( 'CP_HTTP_ROOT',str_replace ( '\ \','/',(! empty ($_SERVER [ 'SCRIPT_NAME'])? dirname ($_SERVER [ 'SCRIPT_NAME']):'/'))); / / root of CP. 

/ / The session cookie. 
define ( 'COOKIE_USER','p'); / / Username in the cookies. 
define ( 'COOKIE_PASS','u'); / / user password in the cookies. 
define ( 'COOKIE_LIVETIME',CURRENT_TIME + 2592000) / / Lifetime cookies. 
define ( 'COOKIE_SESSION','ref'); / / variable to store the session. 
define ( 'SESSION_LIVETIME',CURRENT_TIME + 1300) / / Lifetime of the session. 

////////////////////////////////////////////////// ///////////////////////////// 
/ / Initialize. 
////////////////////////////////////////////////// ///////////////////////////// 

/ / Connect to the database. 
if (! ConnectToDB ()) die (MysqL_error_ex ()); 

/ / Connecting topic. 
require_once (THEME_PATH. '/ index.PHP'); 

/ / Manage login. 
if (! empty ($_GET [QUERY_VAR_MODULE])) 
( 
  / / Login form. 
  if (strcmp ($_GET [QUERY_VAR_MODULE],'login') === 0) 
  ( 
    UnlockSessionAndDestroyAllCokies (); 

    if (isset ($_POST [ 'user']) & & isset ($_POST [ 'pass'])) 
    ( 
      $user = $_POST [ 'user']; 
      $pass = md5 ($_POST [ 'pass']); 

      / / Check login. 
      if (@ MysqL_query ( "SELECT id FROM cp_users WHERE name = '". addslashes ($user). "' AND pass = '". addslashes ($pass). "' AND flag_enabled = '1 'LIMIT 1") & & @ MysqL_affected_rows () == 1) 
      ( 
        if (isset ($_POST [ 'remember']) & & $_POST [ 'remember'] == 1) 
        ( 
          setcookie (COOKIE_USER,md5 ($user),COOKIE_LIVETIME,CP_HTTP_ROOT); 
          setcookie (COOKIE_PASS,$pass,CP_HTTP_ROOT); 
        ) 

        LockSession (); 
        $_SESSION [ 'Name'] = $user; 
        $_SESSION [ 'Pass'] = $pass; 
        / / UnlockSession (); 

        header ( 'Location:'. QUERY_STRING_BLANK. 'home'); 
      ) 
      else ShowLoginForm (true); 
      die (); 
    ) 

    ShowLoginForm (false); 
    die (); 
  ) 

  / / Output 
  if (strcmp ($_GET [ 'm'],'logout') === 0) 
  ( 
    UnlockSessionAndDestroyAllCokies (); 
    header ( 'Location:'. QUERY_STRING_BLANK. 'login'); 
    die (); 
  ) 
) 

////////////////////////////////////////////////// ///////////////////////////// 
/ / Check the login data. 
////////////////////////////////////////////////// ///////////////////////////// 

$logined = 0,/ / flag means,we zalogininy. 

/ / Log in session. 
LockSession (); 
if (! empty ($_SESSION [ 'name']) & &! empty ($_SESSION [ 'pass'])) 
( 
  if (($r = @ MysqL_query ( "SELECT * FROM cp_users WHERE name = '". addslashes ($_SESSION [' name'])."' AND pass = ' ". addslashes ($_SESSION [' pass']). " 'AND flag_enabled = '1' LIMIT 1 ")))$logined = @ MysqL_affected_rows (); 
) 
/ / Login through cookies. 
if ($logined! == 1 & &! empty ($_COOKIE [COOKIE_USER]) & &! empty ($_COOKIE [COOKIE_PASS])) 
( 
  if (($r = @ MysqL_query ( "SELECT * FROM cp_users WHERE MD5 (name )='". addslashes ($_COOKIE [COOKIE_USER ])."' AND pass = '". addslashes ($_COOKIE [COOKIE_PASS]). " 'AND flag_enabled = '1' LIMIT 1 ")))$logined = @ MysqL_affected_rows (); 
) 
/ / Unable to login. 
if ($logined! == 1) 
( 
  UnlockSessionAndDestroyAllCokies (); 
  header ( 'Location:'. QUERY_STRING_BLANK. 'login'); 
  die (); 
) 

/ / Get the user data. 
$_USER_DATA = @ MysqL_fetch_assoc ($r); 
if ($_USER_DATA === false) die (MysqL_error_ex ()); 
$_SESSION [ 'Name'] = $_USER_DATA [ 'name']; 
$_SESSION [ 'Pass'] = $_USER_DATA [ 'pass']; 

/ / Connecting language. 
if (@ strlen ($_USER_DATA [ 'language'])! = 2 | |! SafePath ($_USER_DATA [ 'language']) | |! file_exists ( 'system / lng .'.$_ USER_DATA [' language '].' . PHP'))$_ USER_DATA [ 'language'] = DEFAULT_LANGUAGE; 
require_once ( 'system / lng .'.$_ USER_DATA [' language'].'. PHP '); 

UnlockSession ();