Version 4.8.3 was just released moments ago. It address a SQL Injection issue discovered by Anthony Ferrara
https://twitter.com/ircmaxell/status/923662170092638208
Confirmation from Anthony
https://twitter.com/ircmaxell/status/925366959612538882
WordPress post concerning the update: https://make.wordpress.org/core/2017/10/31/changed-behaviour-of-esc_sql-in-wordpress-4-8-3/ and https://wordpress.org/news/2017/10/wordpress-4-8-3-security-release/
If you have auto-update enabled you should receive the update automatically this morning. If you do not have auto-update enabled, please update ASAP.