The Forminator Forms – Contact Form, Payment Form & Custom Form Builder plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.36.0 via the submit_quizzes() function due to missing validation on the 'entry_id' user controlled key. This makes it possible for unauthenticated attackers to modify other user's quiz submissions.
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.