    public function buildCurrentUrl() {
        $url =  URL_BASE;
        if ($this->url_style == 'sef') {
            $url .= substr(PATH_RELATIVE,0,-1).$this->sefPath;
        } else {
            $url .= urldecode((empty($_SERVER['REQUEST_URI'])) ? $_ENV['REQUEST_URI'] : $_SERVER['REQUEST_URI']);
        }
        return expString::sanitize($url);
    }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.