CVE-2023-47505: Elementor Website Builder XSS Vulnerability

CVE-2023-47505 Overview

CVE-2023-47505 is a Cross-Site Scripting (XSS) vulnerability affecting the Elementor Website Builder plugin for WordPress. The vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject and execute malicious scripts in the context of a victim's browser session. This issue impacts Elementor versions through 3.16.4.

Critical Impact

Authenticated attackers with contributor-level access or above can inject malicious scripts that execute in the browsers of other users, potentially leading to session hijacking, credential theft, or defacement of WordPress sites using the Elementor plugin.

Affected Products

• Elementor Website Builder versions up to and including 3.16.4
• WordPress installations using vulnerable Elementor plugin versions
• Sites utilizing Elementor's attachment rendering functionality

Discovery Timeline

• 2023-11-30 - CVE CVE-2023-47505 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2023-47505

Vulnerability Analysis

This Cross-Site Scripting vulnerability exists within the Elementor Website Builder plugin's handling of attachment rendering. The plugin fails to properly sanitize user-supplied input before incorporating it into generated web pages, creating an avenue for script injection. An authenticated attacker with at least contributor-level privileges can exploit this flaw to execute arbitrary JavaScript code in the context of other users viewing the affected pages.

The attack requires user interaction—a victim must navigate to a page containing the malicious payload. Upon successful exploitation, the injected scripts can access sensitive data within the victim's browser session, including authentication tokens and cookies. The vulnerability has a changed scope, meaning the impact extends beyond the vulnerable component itself to affect other resources within the browser security context.

Root Cause

The root cause of CVE-2023-47505 is insufficient input validation and output encoding in Elementor's arbitrary attachment render functionality. When processing attachment data for display, the plugin does not adequately neutralize potentially dangerous characters and HTML/JavaScript content. This allows specially crafted input to break out of its intended context and be interpreted as executable code by the browser.

The vulnerability falls under CWE-79 (Improper Neutralization of Input During Web Page Generation), a common web application security flaw that enables XSS attacks.

Attack Vector

The attack is conducted over the network and requires the attacker to have low-level authenticated access (contributor role or higher) to the WordPress site. The exploitation path involves:

1. An authenticated attacker creates or modifies content containing a malicious payload within Elementor's attachment rendering context
2. The payload is stored on the server without proper sanitization
3. When other users, including administrators, view the affected page, the malicious script executes in their browser
4. The attacker can then steal session cookies, perform actions on behalf of the victim, or redirect users to malicious sites

The vulnerability allows the injection to affect the confidentiality and integrity of user sessions, though it does not directly impact system availability. Technical details and analysis are available in the Patchstack XSS Vulnerability Article.

Detection Methods for CVE-2023-47505

Indicators of Compromise

• Unexpected JavaScript code or <script> tags within Elementor page content or attachments
• Unusual attachment entries containing encoded payloads or suspicious HTML attributes
• Browser console errors indicating blocked inline scripts (if CSP is configured)
• Reports of session hijacking or unauthorized actions performed on admin accounts

Detection Strategies

• Monitor WordPress database tables for Elementor content containing suspicious script tags, event handlers (onerror, onload, onclick), or JavaScript URIs
• Implement Web Application Firewall (WAF) rules to detect and block XSS payloads in requests targeting Elementor endpoints
• Enable Content Security Policy (CSP) headers to prevent inline script execution and detect policy violations
• Review server access logs for unusual patterns of content creation or modification by contributor-level accounts

Monitoring Recommendations

• Deploy real-time monitoring for changes to Elementor page content and attachment metadata
• Configure alerts for CSP violation reports that may indicate XSS exploitation attempts
• Monitor authentication logs for session anomalies following page views by privileged users
• Regularly audit user-generated content within Elementor for signs of injection attempts

How to Mitigate CVE-2023-47505

Immediate Actions Required

• Update Elementor Website Builder to a version newer than 3.16.4 immediately
• Review existing Elementor content for any signs of injected malicious scripts
• Audit user accounts with contributor-level access or above for unauthorized activity
• Implement or strengthen Content Security Policy headers on affected WordPress sites

Patch Information

The vulnerability affects Elementor Website Builder versions through 3.16.4. Users should update to the latest available version of Elementor to receive the security fix. Patch information and additional technical details can be found in the Patchstack Elementor XSS Database Entry.

Workarounds

• Restrict contributor-level and above access to only trusted users until the patch can be applied
• Implement a Web Application Firewall (WAF) with XSS filtering capabilities to block malicious payloads
• Enable strict Content Security Policy headers to mitigate the impact of any successful XSS injection
• Temporarily disable or limit Elementor's attachment rendering functionality if feasible

# Example: Add Content Security Policy headers in WordPress .htaccess
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
</IfModule>