WordPress just released a critical security update that fixes the 0day vulnerability described below.

http://arstechnica.com/security/2015/04/27/just-released-wordpress-0day-makes-it-easy-to-hijack-millions-of-websites/
Official fix: https://wordpress.org/news/2015/04/wordpress-4-2-1/
Quote
The WordPress content management system used by millions of websites is vulnerable to two newly discovered threats that allow attackers to take full control of the Web server. Attack code has been released that targets one of the latest versions of WordPress, making it a zero-day exploit that could touch off a series of site hijackings throughout the Internet.
http://arstechnica.com/security/2015/04/27/just-released-wordpress-0day-makes-it-easy-to-hijack-millions-of-websites/
Official fix: https://wordpress.org/news/2015/04/wordpress-4-2-1/














