The Post Grid and Gutenberg Blocks – ComboBlocks plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 2.3.6 via the /wp-json/post-grid/v2/get_users REST API This makes it possible for unauthenticated attackers to extract sensitive data including including emails and other user data.
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.