The WPAdverts – Classifieds Plugin plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.3.2. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to retrieve internal site configuration data exposed by the classifieds-types REST endpoint, including registered post types, labels, associated taxonomies, form scheme metadata, contact options, and custom field meta keys.
https://plugins.trac.wordpress.org/browser/wpadverts/tags/2.3.3/includes/class-rest-blocks.php#L49
https://plugins.trac.wordpress.org/browser/wpadverts/tags/2.3.2/includes/class-rest-blocks.php#L50
https://plugins.trac.wordpress.org/browser/wpadverts/tags/2.3.2/includes/class-rest-blocks.php#L13