WordPress Security Update 4.8.2
WordPress version 4.8.2 has been released addressing security vulnerabilities.
The update includes a fix to $wpdb->prepare() to help protect against SQLi injection attacks in addition to 6 maintenance fixes amongst other things.
The existence of these vulnerabilities has become public, and as a result it becomes much more likely they will be exploited. As such, it is very important that you update as soon as possible.
You can find the full announcement here.