    public function add($def, $config) {
        if (!$this->checkDefType($def)) return;
        $file = $this->generateFilePath($config);
        if (file_exists($file)) return false;
        if (!$this->_prepareDir($config)) return false;
        return $this->_write($file, serialize($def), $config);
    }
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.