WordPress 4.8.3 is now available. This is a security release for all previous versions, and you must update your websites immediately.
WordPress versions 4.8.2 and earlier are affected by an issue where unexpected and unsafe queries can lead to potential SQL injection (SQLi). WordPress core is not directly vulnerable to this issue, but special hardening has been added to prevent plugins and themes from accidentally causing a vulnerability.
While WordPress.org already started automatic background updates that do not require you to do anything it may take some time for them to get to your website. If it does not update automatically today, do it yourself (if you are confident enough) or contact Dusk Owl for help.