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

app = Flask(__name__)

top_html = """
    <!doctype html>
    <html lang="en"> <head> <title> Flask App </title>
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <!-- Add Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    </head>
    <body>
        <div class="container">
        <h1> Hello Docker</h1>
        <p> This is an example app to learn how to dockerize a python web app.
        </p><hr>
"""
bot_html = """
        <hr><p> <a href="/">[Home] </a> </p>
        </div>
    </body>
    </html>
"""

@app.route("/")
def index():
    page_content = """
        <p> Follow these links to explore the app:
        </p>
        <ul>
            <li> <a href="/about"> About this app </a> </li>
            <li> <a href="/greeter/User"> Basic Greeter </a> </li>
            <li> <a href="/factorial/3"> Factorial calculator </a> </li>
        </ul>
    """
    index_html = top_html + page_content + bot_html
    return index_html

@app.route('/about')
def about():
    about_html = top_html + """
        <h3> About this app</h3>
        <p> This is an example app to learn how to dockerize a python web app.
        </p>
    """ + bot_html
    return about_html

@app.route('/greeter/<username>')
def greeter(username):
    page_content  = "<h2>Hey there, %s</h2>" %username
    page_content += "<p>Change the last part of URL path to change greeting</p>"
    return top_html + page_content + bot_html

@app.route('/factorial/<int:num>')
def show_post(num):
    # Limit the value for num
    if num > 50:
        num = 50
    page_content = "<h2>Factorial calculator</h2>"
    page_content+= "<p> factorial(%d) = %d" % (num, factorial(num))
    page_content+= "<p>Change the last part of URL path to change input</p>"
    return top_html + page_content + bot_html

# A simple implementation of factorial
def factorial(n):
    if n <= 1:
        return 1
    return n * factorial(n-1)

if __name__ == "__main__":
    app.run(debug=True, host='0.0.0.0')

```

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-601: URL Redirection to Untrusted Site ('Open Redirect')
  D) CWE-326: Inadequate Encryption Strength
  E) CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  F) CWE-215: Insertion of Sensitive Information Into Debugging Code
Answer: B,F