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 cgi
import io
import glob
import os
import json
from bottle import route, run, template, post, request
from requests import get

from nltk.corpus import stopwords
from nltk.tokenize import word_tokenize
from nltk.corpus import wordnet

stop_words = []
files = []
fcontent = {}
fildoclist = []
filwords =[]
pptokens =[]
c_dict = {}

def stopWords(words):
    stop_words = stopwords.words('english')
    for w in words:
        stop_words.append(w)
    print(stop_words)
    return stop_words

@post('/sw') # or @route('/login', method='POST')
def do_sw():
    words = request.json['words']
    words = words.split(',')
    print(words)
    global stop_words
    stop_words = stopWords(words)
    str = ','.join(stop_words)
    str = "{'data':'stopwords','words':'" + str + "'}"
    return str

@post('/swget') # or @route('/login', method='POST')
def do_sw():
    global stop_words
    str = ','.join(stop_words)
    str = "{'data':'stopwords','words':'" + str + "'}"
    return str

@route('/exec/upload', method='POST')
def do_upload():
    global files
    global fcontent
    files = request.files.getall('files')
    print(request.files)
    for f in files:
        fcontent[f.filename] = f.file.read()
    print(fcontent)
    return "Upload success"

@route('/exec/pp', method='POST')  
def do_pp():
    global stop_words
    global fcontent
    global fildoclist
    c = 0
    for file_name in fcontent:
        # Tokenization
        word_tokenize_list = word_tokenize(fcontent[file_name])
        # Stop word Removal
        filteredfilename = "filtered_docs" + "/" + "filter%d.txt" % c
        fildoclist.append(os.path.basename(filteredfilename))
        file2 = open(filteredfilename,'w+')
        for r in word_tokenize_list:
            if not r in stop_words:
                file2.write(r.lower()+" ")
        file2.close()
        collect_tokens(c)
        c+=1
    return "Preprocess sucesss"
    
def collect_tokens(c):
    global fildoclist
    global pptokens
    global filwords
    for f_file_name in fildoclist:
        f_fi = open(f_file_name,'r')
        f_file_content = f_fi.read()
        tokens = f_file_content.split()
        uniquetokens = []
        for i in tokens:
            if i not in uniquetokens:
                uniquetokens.append(i)
        # add each token to pptokens list
        filwords.append(uniquetokens)
        for i in uniquetokens:
            if i not in pptokens:
                pptokens.append(i)
    print(pptokens)

def generating_concepts():
    global pptokens
    global c_dict
    for word in pptokens:
        synonyms = []
        synunique = []
        for syn in wordnet.synsets(word):
            for l in syn.lemmas():
                synonyms.append(l.name())
        for i in synonyms:
            if i not in synunique:
                synunique.append(i)
        c_dict[word] = synunique
    print (c_dict)
    return c_dict

### Localhost process
run(host='localhost', port=3000, debug=True)
```

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

  A) CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  B) CWE-643: Improper Neutralization of Data within XPath Expressions ('XPath Injection')
  C) CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  D) CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
  E) CWE-209: Generation of Error Message Containing Sensitive Information
  F) CWE-502: Deserialization of Untrusted Data
Answer: C