                foreach ($set as $element => $x) {
                    if (isset($this->lookup[$element])) {
                        $add += $this->lookup[$element];
                        unset($this->lookup[$i][$element]);
                    }
                }
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.