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
from flask import Flask, Response
from flask_socketio import SocketIO, send, emit
from flask_cors import CORS

from components.LCD.I2CLCD1602 import display
from components.ultrasonic_ranging import loop_during, get_distance


app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
cors = CORS(app,resources={r"/socket.io/*":{"origins":"*"}})
socketio = SocketIO(app)

@app.route("/")
def hello():
    content = """<h1>Elevator web server</h1>
    <p>An Python Flask web server to master some Raspberry PI components. This server expose some routes:</p>

    <ul>
      <li>GET <a href="/lcd/display/helloworld">/lcd/display/<content></a> to display a message on the LCD screen</li>
      <li>GET <a href="/led/blink">/led/blink</a> to make LED blink</li>
      <li>GET <a href="/sonar/run">/sonar/run/<int:time></a> to get distance on sonar during some time (response on "sonar" socket)</li>
    </ul>

    <p>You can also make theses SOCKET queries</p>

    <ul>
        <li><code>sonar</code> to get distance (response on "sonar" socket)</li>
    </ul>
    """
    return Response(content, mimetype='text/html')

@app.route('/lcd/display/<content>')
def display_lcd(content):
    """Simply read content from URI & display message on LCD screen
    """
    display(content)
    return content

@app.route('/led/blink')
def blink_led():
    """Make LED blink during 5 seconds
    """
    # TODO
    pass

@app.route('/sonar/run/<int:time>')
def run_sonar(time):
    """Get distance on sonar during a given duration & return it on `sonar`
    socket channel

    time parameter is the number of seconds to get distance (each seconds)
    """
    for distance in loop_during(time):
      emit('sonar', (distance), broadcast=True, namespace="/")
      return "finished"

@socketio.on('sonar')
def get_sonar(data):
    """Get distance on sonar & return it on `sonar` socket channel
    """
    distance = get_distance()
    emit('sonar', (distance), broadcast=True, namespace="/")
    print('sonar mesured this distance: %.5f' % distance)


@socketio.on('message')
def handle_message(message):
  print('received message: ' + message)

if __name__ == '__main__':
  socketio.run(app)

```

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

  A) CWE-209: Generation of Error Message Containing Sensitive Information
  B) CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  C) CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
  D) CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
  E) CWE-215: Insertion of Sensitive Information Into Debugging Code
  F) CWE-614: Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
Answer: B