Wordpress have announced a vulnerability affecting all versions of Wordpress before v4.4 and have released an update to address this: https://wordpress.org/news/2016/01/wordpress-4-4-1-security-and-maintenance-release/
If you are running an older version that does not support automatic updates, please upgrade your installation as soon as possible to ensure the security of your site.
Quinta-feira, Janeiro 7, 2016