The Essential Real Estate WordPress plugin before 5.3.5 does not verify ownership of an invoice before rendering it in one of its AJAX actions, allowing an authenticated low-privileged user to read other users' invoices, including the invoice owner's name, account email address and financial details.
https://wpscan.com/vulnerability/745cf24b-2dbd-41ea-b26d-d1c6f0a25de9/