Update the WordPress Core to 3.9.2
If you haven’t already, please upgrade your WordPress core to version 3.9.2. This release contains an important fix for a possible denial-of-service vulnerability in PHP’s XML processing. You can find out more about the fix on the official WordPress blog.
Gmedia Gallery Plugin Vulnerability
What to do: If you are using the Gmedia Gallery WordPress plugin, upgrade to the newest release immediately.