The Simple Bike Rental plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the 'simpbire_carica_prenotazioni' AJAX action in all versions up to, and including, 1.0.6. This makes it possible for authenticated attackers, with Subscriber-level access and above, to retrieve all booking records containing customers' personally identifiable information (PII), including names, email addresses, and phone numbers.
CWE-862