CVE-2024-11816: WP Extended Plugin RCE Vulnerability

CVE-2024-11816 Overview

The Ultimate WordPress Toolkit – WP Extended plugin for WordPress contains a Remote Code Execution vulnerability in version 3.0.11. The flaw stems from a missing capability check on the wpext_handle_snippet_update function. Authenticated attackers with Subscriber-level access or higher can execute arbitrary PHP code on the server, provided an administrator has previously created at least one code snippet. The vulnerability is tracked under CWE-862: Missing Authorization and affects WordPress sites that permit user registration or maintain low-privilege accounts.

Critical Impact
Authenticated Subscriber-level attackers can modify existing PHP code snippets to execute arbitrary code, leading to full site compromise.

Affected Products

Wpextended Ultimate WordPress Toolkit – WP Extended plugin
All versions up to and including 3.0.11
WordPress sites with at least one existing code snippet created by an administrator

Discovery Timeline

2025-01-08 - CVE-2024-11816 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-11816

Vulnerability Analysis

The vulnerability resides in the wpext_handle_snippet_update function within the plugin's snippet management module. The function processes updates to stored PHP code snippets but fails to verify whether the requesting user has the appropriate WordPress capability to modify snippets. WordPress capability checks normally restrict administrative functions to users with roles such as Administrator or Editor. Without this check, any authenticated user, including Subscribers, can invoke the update handler.

Code snippets in the WP Extended plugin are stored and executed as PHP within the WordPress runtime. When an attacker replaces snippet content, the injected PHP executes on subsequent snippet invocation, providing a path from low-privilege authentication to full server-side code execution.

Root Cause

The root cause is the absence of a current_user_can() capability check inside the AJAX or admin-post handler responsible for updating snippets. The affected code path is referenced in the WordPress plugin repository. The handler accepted requests based on authentication alone rather than authorization, violating the principle of least privilege.

Attack Vector

Exploitation requires a valid WordPress account with Subscriber privileges or higher. WordPress sites that expose open registration (wp-login.php?action=register) present the lowest barrier. The attacker authenticates, then submits a crafted request to the snippet update endpoint containing malicious PHP payload. The plugin overwrites the target snippet without verifying user role. Execution occurs when the modified snippet is triggered by the plugin's runtime loader.

The vulnerability is described in detail in the Wordfence Vulnerability Analysis. No public proof-of-concept has been released, but the exploitation pattern follows well-documented WordPress missing-capability-check techniques.

Detection Methods for CVE-2024-11816

Indicators of Compromise

Unexpected modifications to existing PHP snippets stored by the WP Extended plugin, particularly changes made by non-administrator accounts.
New Subscriber-level user registrations followed shortly by POST requests to WordPress admin-ajax or admin-post endpoints referencing wpext_snippets.
Outbound network connections initiated by the PHP-FPM or web server process to unknown hosts after snippet-related requests.
Web shell artifacts, cron modifications, or new administrator accounts created after suspicious snippet update activity.

Detection Strategies

Monitor WordPress access logs for POST requests to admin-ajax.php or admin-post.php containing the wpext_handle_snippet_update action from non-administrator user sessions.
Enable WordPress audit logging to capture changes to plugin-managed code snippets and correlate the modifying user's role.
Compare stored snippet contents against a known-good baseline hash on a scheduled basis.

Monitoring Recommendations

Alert on new user registrations that immediately generate authenticated requests to plugin administration endpoints.
Track file integrity across the WordPress wp-content/plugins/wpextended/ directory and any locations where snippets are persisted.
Ingest web server and application logs into a centralized platform to correlate authentication events with sensitive plugin actions.

How to Mitigate CVE-2024-11816

Immediate Actions Required

Update the Ultimate WordPress Toolkit – WP Extended plugin to a version later than 3.0.11 that includes the capability check fix referenced in the vendor changeset.
Audit all existing code snippets managed by the plugin and revert any unexpected changes.
Review the WordPress user list and remove or disable unnecessary Subscriber and low-privilege accounts.
Rotate credentials for administrator accounts and any secrets that may have been exposed through executed snippets.

Patch Information

The vendor addressed the issue by adding an authorization check to the snippet update handler. Details of the fix are available in the WordPress plugin changeset. Administrators should apply the plugin update through the WordPress admin dashboard or via WP-CLI.

Workarounds

Disable the WP Extended plugin until the patched version has been deployed if immediate patching is not feasible.
Disable open user registration by setting Anyone can register to off under Settings > General in WordPress.
Restrict access to admin-ajax.php and admin-post.php at the web application firewall to block requests referencing the vulnerable action from non-administrator sessions.
Remove all existing code snippets managed by the plugin, since exploitation requires at least one snippet to be present.

bash

# Update the plugin via WP-CLI
wp plugin update wpextended

# Verify installed version
wp plugin get wpextended --field=version

# Optionally deactivate until patched
wp plugin deactivate wpextended