Syncee for Suppliers <= 1.0.5 - Missing Authorization to Sensitive Information Disclosure

The Syncee for Suppliers plugin for WordPress is vulnerable to Missing Authorization to Sensitive Information Disclosure in versions up to, and including, 1.0.5. This is due to a missing capability check on the /wp-json/syncee/supplier/v1/getDataForFrontend REST-API endpoint. This makes it possible for unauthenticated attackers to perform a GET request to that information that discloses information like the site's syncee_access_token_supplier and data_to_syncee_installer_supplier values.