What Is XML-RPC in WordPress?

XML-RPC is a communication protocol that allows external applications and services to interact with a WordPress website remotely.

The name comes from two technologies:

• XML (Extensible Markup Language) – used to structure and transmit data.
• RPC (Remote Procedure Call) – a method that allows one system to execute actions on another system remotely.

Together, XML-RPC enables external applications to send commands to WordPress and receive responses over the internet.

What Is XML-RPC Used For?

XML-RPC was introduced to allow users to manage WordPress websites without logging in directly to the administration panel.

Common uses included:

• Publishing posts from desktop applications
• Publishing content from mobile applications
• Connecting WordPress to external services
• Managing websites remotely

Data is transmitted using XML, while HTTP is used as the communication channel between WordPress and the external application.

How Does XML-RPC Work?

When an external application sends a request to a WordPress website, the XML-RPC service receives the request and performs the requested action if authentication is successful.

Examples of actions include:

• Creating posts
• Editing content
• Uploading media files
• Retrieving website information
• Managing comments

The XML-RPC endpoint is typically available at:

/xmlrpc.php

For example:

https://yourdomain.com/xmlrpc.php

XML-RPC and Modern WordPress

In earlier versions of WordPress, XML-RPC had to be enabled manually.

Since WordPress 3.5, XML-RPC has been enabled by default.

Today, many of its original functions have been replaced by the WordPress REST API, which provides a more modern way for applications and services to communicate with WordPress.

Security Considerations

Because XML-RPC accepts remote requests, it is sometimes targeted by automated attacks, including:

• Brute-force login attempts
• Distributed denial-of-service (DDoS) amplification attacks
• Excessive automated requests

If your website does not require XML-RPC functionality, some security plugins and hosting environments allow access to the feature to be restricted or disabled.

How to Check Whether XML-RPC Is Enabled

You can verify whether XML-RPC is available by visiting:

https://yourdomain.com/xmlrpc.php

If the service is active, WordPress typically displays a message indicating that XML-RPC accepts only POST requests.

Summary

XML-RPC is a remote communication protocol that allows external applications and services to interact with WordPress using XML and HTTP. While it was originally designed to support remote publishing and management, many of its functions are now handled through the WordPress REST API. Despite this, XML-RPC remains enabled by default on many WordPress installations for compatibility purposes.