Understanding the Risks of xmlrpc.php in WordPress and How to Disable It

The xmlrpc.php file is a legacy WordPress feature designed to allow data transmission between your website and other systems using HTTP as a transport mechanism and XML for encoding. Originally created to facilitate offline blog clients when internet connections were slow, it has since become a significant security liability for modern websites. While it once played a vital role in remote posting and mobile app synchronization, its functionality is largely being replaced by the more secure WordPress REST API.

The Primary Security Risks

Because xmlrpc.php is enabled by default in WordPress, it remains a common target for automated attacks. There are two primary ways hackers exploit this file:

• Advanced Brute Force Attacks: Attackers use the file to test hundreds of username and password combinations in a single command. This allows them to bypass standard security tools and login attempt limits that usually only monitor the main login page.
• DDoS via Pingbacks: The file handles “pingbacks,” which are notifications that another site has linked to yours. Hackers can exploit this feature to send thousands of pingbacks to other websites simultaneously, effectively using your server as part of a massive botnet to launch Distributed Denial of Service (DDoS) attacks.

How to Disable xmlrpc.php

If you do not use the WordPress mobile app or specific features of the Jetpack plugin, it is highly recommended to disable this file entirely to reduce your attack surface.

Method 1: Using Security Plugins
For many users, using a dedicated security plugin is the most straightforward way to deactivate XML-RPC. While I typically recommend the manual approach to keep your installation lean and minimize overhead, several reputable tools offer a quick, “set-and-forget” solution.

You can use specialized tools like Disable XML-RPC, which automates the code insertion for you, or Stop XML-RPC Attack, which provides more granular control by blocking malicious attempts while allowing legitimate connections from tools like Jetpack to remain active. Additionally, comprehensive security suites such as Solid Security (formerly iThemes) include built-in toggles to mitigate XML-RPC abuse directly from your WordPress dashboard.

Method 2: Manual Disabling via .htaccess
For those who prefer a manual approach without adding more plugins, you can block requests at the server level using your .htaccess file. By adding the following code to the file in your root directory, you stop requests before they are even passed to WordPress:

<Files "xmlrpc.php">
    Require all denied
</Files>

If you still need access for a specific service, you can add an Allow from [IP Address] line to permit only trusted traffic.

Conclusion

While xmlrpc.php served a purpose in the early days of the web, it is now more of a problem than a solution for most WordPress administrators. By disabling it manually or via a plugin, you eliminate a persistent entry point for brute force bots and ensure your site isn’t weaponized for DDoS attacks.