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 Blueprint, request, jsonify, redirect, url_for
from twitoff.twitter import add_or_update_user, update_all_users, add_users, TWITTER_USERS
from twitoff.models import db, User, Tweet

user_routes = Blueprint("user_routes", __name__)


@user_routes.route('/user', methods=['POST'])
def add_user(message=None):
    try:
        data = request.get_json(force=True)
        username = data['username']
        users = User.query.all()
        user_handle_list = [user.handle for user in users]
        if username in user_handle_list:
            add_or_update_user(username)
            message = f'User {username} already added, updating user tweets!'
            print(f'[DEBUG] {message}')
            success = True
        else:
            try:
                add_or_update_user(username)
                message = "User {} successfully added!".format(
                    username)
                print(f'[DEBUG] {message}')
                success = True
            except Exception as e:
                message = "Error adding {}: {}".format(username, e)
                print(f'[DEBUG] {message}')
                success = False
    except Exception as e:
        message = "Error adding {}: {}".format(username, e)
        print(f'[DEBUG] {message}')
        success = False
    return jsonify({'success': success, 'message': message})


@user_routes.route('/user/<username>', methods=['GET'])
def get_user_info(username=None):
    try:
        tweets = [tweet.text for tweet in User.query.filter(
            User.handle == username).one().tweets]
        success = True
        message = f"Successfully fetched Tweets for {username}"
    except Exception as e:
        tweets = []
        success = False
        message = "Error getting tweets for {}: {}".format(username, e)
        print(f'[DEBUG] {message}')
    return jsonify({"success": success, "message": message, "data": tweets})


@user_routes.route('/update')
def update():
    users = User.query.all()
    update_all_users()
    return redirect(url_for('home_routes.get_home'))


@user_routes.route('/delete/<username>', methods=['DELETE'])
def delete_user(username):
    try:
        user = User.query.filter(User.handle == username).one()
        db.session.delete(user)
        db.session.commit()
        success = True
        message = f'{user } has been sucessfully deleted.'
        print(f"[DEBUG] {message}")
    except Exception as e:
        success = False
        message = "User not found."
    return jsonify({'success': success, 'message': message})

```

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

  A) CWE-94: Improper Control of Generation of Code ('Code Injection')
  B) CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  C) CWE-614: Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
  D) CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
  E) CWE-295: Improper Certificate Validation
  F) CWE-209: Generation of Error Message Containing Sensitive Information
Answer: F