    private function div($s1, $s2, $scale) {
        if ($this->bcmath) return bcdiv($s1, $s2, $scale);
        else return $this->scale($s1 / $s2, $scale);
    }
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.