SQL injection vulnerability in Booking Calendar plugin 8.4.3 for WordPress allows remote attackers to execute arbitrary SQL commands via the booking_id parameter.
https://www.exploit-db.com/exploits/46377/
https://vulners.com/exploitdb/EDB-ID:46377
https://gist.github.com/B0UG/a750c2c204825453e6faf898ea6d09f6
http://packetstormsecurity.com/files/151692/WordPress-Booking-Calendar-8.4.3-SQL-Injection.html