In the last 24 hours WordPress have released update 3.9.2 which fixes security vulnerabilities in all previous releases of WordPress.
To read full details of the update, see the news release from WordPress: http://wordpress.org/news/2014/08/wordpress-3-9-2/
It is strongly advised that all WordPress users update to the latest version of WordPress to keep your site secure and running well.
As you would with any other update, please ensure you fully back up your site before installing any updates (plugin or WordPress) to it.
If you’re at all unsure about how to do this or you’re worried about losing your site as you don’t have a back up solution in place – don’t forget to check out the WordPress Maintenance Packages on offer at Virtually Angels. Your updates are installed on a regular basis for you and your site backed up with the last 30 back ups stored should the worst happen and you need to reinstall!
Read more about the WordPress Maintenance Packages here.