xmlrpc.com is a WordPress file that was intended to be used for API’s but lately it’s more and more used as a way for hackers to brute-force WordPress installations.

To block access to xmlrpc.php on a single WordPress installation add the following code to your .htaccess file:

<Files xmlrpc.php>
order deny,allow
 deny from all
 allow from

And in WHM to block access to xmlrpc.php file for all websites hosted on cPanel, add the following to WHM > Service Configuration > Apache Configuration > Include Editor

<IfModule mod_alias.c>
  RedirectMatch 301 /xmlrpc.php
How to stop xmlrpc.php attacks on WordPress in Cpanel / WHM server

All request to xmprpc.php file across all cPanel account will be blocked.