Huge increase in WordPress xmlrpc.php POST requests

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Mitigate wp.getUserBlogs xmlrpc.php attacks and enumeration scans

It should be possible to mitigate against this wp.getUserBlogs enumeration scan with a filter, which we put in our THEME functions.php file. Basically it’s the same as the filter below to disable the pingback.ping function.

Or this one

from

Huge increase in WordPress xmlrpc.php POST requests

ADDED 15/07/2014

The best solution untill now, because it doesn’t produce high CPU usage like the other solutions
adding the following to htaccess file:

From:
http://wordpress.org/support/topic/resolving-xmlrpcphp-ddos-attack-with-htaccess-redirect