While looking into something related to the now discontinued WooCommerce Blocks plugin from Automattic, we noticed what appeared to be a vulnerability in that. That plugin has long been incorporated into the main WooCommerce plugin and we confirmed the vulnerability exists in the latest version of that plugin. The vulnerability exposes information that isn’t meant to be public about WooCommerce products through the WooCommerce Store API. There are possibly more issues related to that API, as we have only looked into this specific issue so far.

According to the Store API Guiding principles, private data shouldn’t be provided through the API (emphasis theirs): “Store data such as settings (for example, store currency) is permitted in responses, but private or sensitive data must be avoided.” Despite that statement, it doesn’t appear that some basic security reviewing has been done on the code. And it hasn’t been done in years, as the vulnerable code dates back four years. More thoroughly reviewing that needs to be done by Automattic. [Read more]