https://wccftech.com/wordpress-upgrade-version-4-8-3-asap/

Millions of websites running on WordPress are vulnerable to security threats as the company has pushed a latest version to fix a critical SQL-Injection vulnerability. The popular content management system had released version 4.8.2 last month to fix this exact same flaw, however, unfortunately it just broke a number of sites without patching the flaw.

The newly released WordPress version 4.8.3 thankfully does fix the security vulnerability according to Anthony Ferrara who first discovered and reported this issue to WordPress (and was ignored for weeks). The bug can be potentially exploited by attackers to hijack WordPress powered websites, by injecting malicious SQL commands.