The Donations WordPress plugin through 1.8 does not sanitise and escape the nd_donations_id parameter before using it in a SQL statement via the nd_donations_single_cause_form_validate_fields_php_function AJAX action (available to unauthenticated users), leading to an unauthenticated SQL Injection
https://wpscan.com/vulnerability/b81e824c-d2b1-4381-abee-18c42bb5c2f5