system: You are an expert security code reviewer. You will be shown a source code file along with a multi-select question listing several CWE (Common Weakness Enumeration) categories. Your task is to identify which of the listed CWEs are present in the code.

OUTPUT FORMAT: Respond with the letter(s) of all correct options, sorted alphabetically and comma-separated, wrapped in a single \boxed{...}. Examples: `\boxed{A}` for one correct, `\boxed{A,C}` for two, `\boxed{A,C,E}` for three. Output the boxed answer ONLY -- no explanation, no other text.

user: ```python
import shutil
import os
import json
import glob
import yaml
import sys
import urllib
import ssl
import csv
import time
import requests
import json
import csv

def dwn(url, opath):

    if os.path.exists(opath):
        return

    dirname = os.path.dirname(opath)
    os.makedirs(dirname, exist_ok=True)

    try:
        result = requests.get(url).json()

        with open(opath, 'w') as outfile:
            json.dump(result, outfile, ensure_ascii=False,
                indent=4, sort_keys=True, separators=(',', ': '))
    
    except Exception as e:
        print("Err", url)

st_path = "data/structured.json"

with open(st_path) as f:
    st = json.load(f)

for key in st:
    obj = st[key]

    if "wiki" in obj:
        wiki = urllib.parse.unquote(obj["wiki"])
        print(wiki)

        if "www.wikidata" in wiki:

            ln = obj["uri"].split(":")[1]

            wikidata = wiki+".json"
            print(wikidata)
            opath = "data/wikidata/"+ln+".json"
            dwn(wikidata, opath)
        else:
            ln = wiki.split("/")[-1]

            dbpedia_ja = "http://ja.dbpedia.org/data/" + ln + ".json"

            opath = "data/dbpedia_ja/"+ln+".json"

            if not os.path.exists(opath):
                dirname = os.path.dirname(opath)
                os.makedirs(dirname, exist_ok=True)

                try:
                    result = requests.get(dbpedia_ja).json()

                    with open(opath, 'w') as outfile:
                        json.dump(result, outfile, ensure_ascii=False,
                            indent=4, sort_keys=True, separators=(',', ': '))

                    
                    
                except Exception as e:
                    print("Err", dbpedia_ja)

            if os.path.exists(opath):
                with open(opath) as f:
                    df = json.load(f)

                    uri = "http://ja.dbpedia.org/resource/"+ln

                    if uri not in df:
                        continue

                    obj = df[uri]

                    if "http://www.w3.org/2002/07/owl#sameAs" in obj:

                        sames = obj["http://www.w3.org/2002/07/owl#sameAs"]

                        for s in sames:
                            if "www.wikidata.org" in s["value"]:
                                wikidata = s["value"]+".json"
                                opath = "data/wikidata/"+ln+".json"
                                dwn(wikidata, opath)

            
```

Which of the following CWE vulnerability categories are present in this code? Multiple options may be correct.

  A) CWE-20: Improper Input Validation
  B) CWE-643: Improper Neutralization of Data within XPath Expressions ('XPath Injection')
  C) CWE-614: Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
  D) CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
  E) CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
  F) CWE-94: Improper Control of Generation of Code ('Code Injection')
Answer: A