Discuz“您当前的访问请求当中含有非法字符“的解决方法

• 故障描述：
  退出登录时出现”您当前的访问请求当中含有非法字符，已经被系统拒绝“错误。如下图：
• 
• 解决方法：
  打开 \source\class\discuz\discuz_application.php 文件
  找到
  private function _xss_check() {

  static $check = array(‘”‘, ‘>’, ‘<‘, ‘\”, ‘(‘, ‘)’, ‘CONTENT-TRANSFER-ENCODING’);

  if(isset($_GET[‘formhash’]) && $_GET[‘formhash’] !== formhash()) {
  system_error(‘request_tainting’);
  }

  if($_SERVER[‘REQUEST_METHOD’] == ‘GET’ ) {
  $temp = $_SERVER[‘REQUEST_URI’];
  } elseif(empty ($_GET[‘formhash’])) {
  $temp = $_SERVER[‘REQUEST_URI’].file_get_contents(‘php://input’);
  } else {
  $temp = ”;
  }

  if(!empty($temp)) {
  $temp = strtoupper(urldecode(urldecode($temp)));
  foreach ($check as $str) {
  if(strpos($temp, $str) !== false) {
  system_error(‘request_tainting’);
  }
  }
  }

  return true;
  }
  修改为
  private function _xss_check() {
  $temp = strtoupper(urldecode(urldecode($_SERVER[‘REQUEST_URI’])));
  if(strpos($temp, ‘<‘) !== false || strpos($temp, ‘”‘) !== false || strpos($temp, ‘CONTENT-TRANSFER-ENCODING’) !== false) {
  system_error(‘request_tainting’);
  }
  return true;
  }