Language: PHP
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product 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.

Code:
                $select .= '<option value="' . $id . '" ' . ($id == $checked_val ? 'selected="selected"' : '') . '>' . $hp->purify($name) . '</option>';
            }
            $select .= '</optgroup>';
        }
        $select .= '</select>';
        return $select;
    }