CVE-2024-5416: Elementor Website Builder XSS Vulnerability

CVE-2024-5416 Overview

CVE-2024-5416 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the Elementor Website Builder plugin for WordPress. The vulnerability exists in the url parameter of multiple widgets across all versions up to and including 3.23.4. Due to insufficient input sanitization and output escaping on user-supplied attributes, authenticated attackers with contributor-level access or higher can inject arbitrary web scripts into Elementor Editor pages. This vulnerability was partially addressed in version 3.23.2 before receiving a complete patch.

Critical Impact

Authenticated attackers with contributor-level access can inject malicious scripts that execute in the context of other users viewing affected Elementor pages, potentially leading to session hijacking, credential theft, or further malicious activities.

Affected Products

• Elementor Website Builder plugin for WordPress versions up to and including 3.23.4
• WordPress installations running vulnerable Elementor versions
• Multiple Elementor widgets including Image, Social Icons, Testimonial, and Button widgets

Discovery Timeline

• September 11, 2024 - CVE-2024-5416 published to NVD
• September 26, 2024 - Last updated in NVD database

Technical Details for CVE-2024-5416

Vulnerability Analysis

This Stored XSS vulnerability stems from improper handling of the url parameter across multiple Elementor widgets. When users with contributor-level permissions or higher create or edit pages using Elementor, the plugin fails to properly sanitize and escape URL inputs before storing them in the database and rendering them in the page output. The stored nature of this XSS makes it particularly dangerous, as malicious scripts persist and execute each time an affected page is loaded.

The vulnerability affects multiple widget components including the Image widget, Social Icons widget, Testimonial widget, and the Button trait used across various widgets. Each of these components processes URL parameters without adequate validation, creating multiple attack surfaces within a single plugin installation.

Root Cause

The root cause is insufficient input sanitization and output escaping on user-supplied URL attributes within Elementor's widget rendering logic. The affected widget files—image.php, social-icons.php, testimonial.php, and button-trait.php—do not properly validate or escape the URL parameter before outputting it to the page. This allows attackers to craft URLs containing JavaScript payloads that bypass the plugin's security controls and execute in victims' browsers.

Attack Vector

The attack vector requires network access and authenticated access with at least contributor-level privileges on the WordPress installation. The attacker must have the ability to create or edit pages using the Elementor editor.

The exploitation process involves:

1. An attacker with contributor access navigates to the Elementor page editor
2. The attacker adds a vulnerable widget (Image, Social Icons, Testimonial, or Button) to a page
3. In the widget's URL field, the attacker injects a malicious JavaScript payload disguised as a URL
4. When other users (including administrators) view the page or edit it in Elementor, the malicious script executes in their browser context

Since no verified proof-of-concept code is available, administrators should review the Wordfence Vulnerability Analysis for detailed technical information on the vulnerability mechanism.

Detection Methods for CVE-2024-5416

Indicators of Compromise

• Presence of suspicious JavaScript code within Elementor widget URL fields in the WordPress database
• Unexpected <script> tags or event handlers (e.g., onerror, onload) embedded in page content created with Elementor
• Reports from users experiencing unexpected browser behavior or redirects when viewing Elementor-built pages
• Audit logs showing contributor-level users modifying widget URL parameters with unusual patterns

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect XSS payloads in POST requests to Elementor endpoints
• Deploy content security policies (CSP) that report violations when inline scripts attempt to execute
• Utilize WordPress security plugins with XSS detection capabilities to scan stored content for malicious patterns
• Monitor Elementor widget configurations in the database for suspicious URL values containing JavaScript

Monitoring Recommendations

• Enable verbose logging for the Elementor plugin and review logs for unusual URL parameter submissions
• Configure browser-based XSS detection through Content Security Policy violation reporting
• Set up automated scanning of WordPress database tables containing Elementor widget data for known XSS patterns
• Monitor user activity logs for contributor-level users making bulk widget modifications

How to Mitigate CVE-2024-5416

Immediate Actions Required

• Update Elementor Website Builder plugin to version 3.23.5 or later immediately
• Review all pages created with Elementor for potentially malicious widget URL values
• Audit user accounts with contributor-level access and revoke unnecessary permissions
• Implement a Content Security Policy to mitigate the impact of any existing XSS payloads

Patch Information

Elementor has released patches addressing this vulnerability. The initial partial fix was included in version 3.23.2, with a complete fix released in subsequent versions. Administrators should update to the latest available version to ensure full protection.

Patch details can be reviewed at:

• WordPress Changeset #3123936 - Initial partial patch
• WordPress Changeset #3149264 - Complete fix

Workarounds

• Restrict contributor-level access on WordPress installations until the patch can be applied
• Implement server-side WAF rules to filter potentially malicious URL parameters in Elementor requests
• Enable Content Security Policy headers with script-src directives to prevent inline script execution
• Temporarily disable affected widgets (Image, Social Icons, Testimonial, Button) if patching is not immediately possible

# Example Content Security Policy header configuration for Apache
# Add to .htaccess file in WordPress root directory
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' https://trusted-cdn.com; style-src 'self' 'unsafe-inline';"
</IfModule>