    public function __construct() {
        $this->registerFilter(new HTMLPurifier_URIFilter_DisableExternal());
        $this->registerFilter(new HTMLPurifier_URIFilter_DisableExternalResources());
        $this->registerFilter(new HTMLPurifier_URIFilter_DisableResources());
        $this->registerFilter(new HTMLPurifier_URIFilter_HostBlacklist());
        $this->registerFilter(new HTMLPurifier_URIFilter_SafeIframe());
        $this->registerFilter(new HTMLPurifier_URIFilter_MakeAbsolute());
        $this->registerFilter(new HTMLPurifier_URIFilter_Munge());
    }
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.