SiteSEO – SEO Simplified vulnerabilities

The SiteSEO – SEO Simplified plugin for WordPress is vulnerable to Improper Authorization leading to Sensitive Post Meta Disclosure in versions up to and including 1.3.2. This is due to missing object-level authorization checks in the resolve_variables() AJAX handler. This makes it possible for authenticated attackers with the siteseo_manage capability (e.g., Author-level users who have been granted SiteSEO access by an administrator) to read arbitrary post metadata from any post, page, attachment, or WooCommerce order they cannot edit, via the custom field variable resolution feature granted they have been given access to SiteSEO by an administrator and legacy storage is enabled. In affected WooCommerce installations, this exposes sensitive customer billing information including names, email addresses, phone numbers, physical addresses, and payment methods.

The SiteSEO – SEO Simplified plugin for WordPress is vulnerable to unauthorized modification of data due to an incorrect capability check on the siteseo_reset_settings function in all versions up to and including 1.3.2. This allows authenticated attackers with access to at least one SiteSEO setting capability to reset the plugin's settings.

The SiteSEO – SEO Simplified plugin for WordPress is vulnerable to Missing Authorization in versions up to and including 1.3.1. The plugin does not properly verify that a user is authorized to perform an action. An authenticated attacker with Author-level access or higher can enable or disable arbitrary SiteSEO features that they should not have access to.