CVE-2024-51588

Executive Summary

CVE-2024-51588 is a DOM-Based Cross-Site Scripting (XSS) vulnerability discovered in the Themehat Super Addons for Elementor WordPress plugin, affecting all versions up to and including 1.0. The vulnerability stems from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject malicious scripts that execute in the context of a victim's browser. This is a client-side attack vector that requires user interaction, such as clicking a crafted link or visiting a compromised page. The CVSS score of 6.5 (Medium) reflects the low complexity and network-based attack vector, but the requirement for user interaction reduces the overall severity. As a WordPress plugin vulnerability, it specifically impacts sites using the Elementor page builder with this add-on installed. No public proof-of-concept or patch is currently available, increasing the risk for unpatched installations.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed through the official WordPress plugin repository. The plugin is not an NPM, PyPI, Go, or Ruby package, but it is part of the WordPress ecosystem. The lack of a patch and the plugin's potential inclusion in theme bundles or site builds creates a supply chain risk for site administrators who rely on automatic updates or third-party maintenance.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
• Attack Complexity (AC): Low (L) - No special conditions or complex attack sequences are required.
• Privileges Required (PR): None (N) - The attacker does not need any authentication.
• User Interaction (UI): Required (R) - The victim must click a link or visit a crafted page.
• Scope (S): Changed (C) - The impact extends beyond the vulnerable component, affecting the user's browser session.
• Confidentiality (C): Low (L) - Limited data exposure, such as session tokens or cookies.
• Integrity (I): Low (L) - Limited ability to modify content or actions within the user's session.
• Availability (A): None (N) - No impact on system availability.

Threat Level: Medium. The vulnerability is exploitable with low complexity but requires user interaction. The primary risk is data theft, session hijacking, or defacement within the victim's browser context.

Deep Dive & Mechanics

The vulnerability is a DOM-Based XSS, meaning the injection occurs entirely on the client side. The plugin's JavaScript code processes user input (e.g., URL fragments, query parameters, or form data) and writes it directly into the Document Object Model (DOM) without proper sanitization. For example, if the plugin reads a parameter like ?name=<script>alert(1)</script> and inserts it into an element's innerHTML, the script executes.

The vulnerable code likely resides in the plugin's frontend JavaScript files, which handle dynamic content rendering for Elementor widgets. Since the plugin version is <= 1.0, it may lack input validation or output encoding for user-controlled data. The attack flow is:

1. Attacker crafts a malicious URL or injects payload into a page element.
2. Victim visits the crafted URL or page.
3. The plugin's JavaScript reads the malicious input and inserts it into the DOM.
4. The browser executes the injected script, leading to XSS.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is presumed to be in the plugin's JavaScript files. A typical vulnerable pattern might be:

// Vulnerable code (super-addons-for-elementor/assets/js/frontend.js)
var userInput = window.location.hash.substring(1);
document.getElementById('dynamic-content').innerHTML = userInput;

A patched version would sanitize the input before DOM insertion:

// Patched code
var userInput = window.location.hash.substring(1);
var sanitizedInput = DOMPurify.sanitize(userInput);
document.getElementById('dynamic-content').textContent = sanitizedInput;

Alternatively, using textContent instead of innerHTML prevents HTML injection.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

1. Install WordPress with Elementor and Super Addons for Elementor v1.0.
2. Create a page using the vulnerable widget (e.g., a dynamic text widget that reads URL parameters).
3. Craft a payload: http://target-site.com/?name=<img src=x onerror=alert(document.cookie)>

Exploitation Steps:

1. Identify the vulnerable parameter by analyzing the plugin's JavaScript (e.g., ?name, #hash).
2. Construct a payload that executes JavaScript, such as:

   <svg onload=alert('XSS')>
   

3. Deliver the link via phishing email or social engineering.
4. When the victim clicks the link, the script executes in their browser, potentially stealing cookies or session tokens.

Note: No public exploit code is available, so this is a theoretical approach.

Blue Team (Defensive)

Detection Steps:

1. Monitor web server logs for suspicious URL patterns containing <script>, <img onerror>, or similar XSS vectors.
2. Use a Web Application Firewall (WAF) to block common XSS payloads.
3. Implement Content Security Policy (CSP) headers to restrict script execution.
4. Regularly scan WordPress plugins for known vulnerabilities using tools like WPScan.

Mitigation:

• Disable or remove the plugin until a patch is released.
• Apply virtual patching via WAF rules.
• Educate users about phishing links.

Indicators of Compromise (IOCs)

• URL Patterns: Requests containing ?name=<script>, #<svg onload>, or similar XSS payloads.
• Log Entries: HTTP requests with unusual query parameters or fragments targeting the plugin's JavaScript files.
• Client-Side Artifacts: Browser console errors or unexpected script execution on pages using Super Addons for Elementor.
• File Hashes: The plugin's JavaScript files (e.g., super-addons-for-elementor/assets/js/frontend.js) with MD5 hash UNKNOWN (no specific version available).

Detection Engineering

YARA Rule

rule CVE_2024_51588_DOM_XSS {
    meta:
        description = "Detects potential DOM-based XSS in Super Addons for Elementor"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-51588"
    strings:
        $vuln_func = /\.innerHTML\s*=\s*[^;]*window\.location/
        $vuln_param = /\.hash|\.search|\.href/
    condition:
        $vuln_func and $vuln_param
}

Sigma Rule

title: CVE-2024-51588 DOM-Based XSS in Super Addons for Elementor
id: 8a3f2c1e-5d7b-4a9f-8c6e-1b2d3e4f5a6b
status: experimental
description: Detects HTTP requests with potential XSS payloads targeting the plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains:
            - '<script>'
            - '<img onerror'
            - '<svg onload'
            - 'alert('
    condition: selection
falsepositives:
    - Legitimate use of similar patterns in other contexts
level: medium

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2024-51588 DOM-Based XSS Attempt";
    flow:to_server,established;
    content:"super-addons-for-elementor"; http_uri;
    pcre:"/(<script|<img onerror|<svg onload|alert\()/i";
    classtype:web-application-attack;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

1. Immediate Action: Disable the "Super Addons for Elementor" plugin until a patched version is released.
2. Virtual Patching: Deploy WAF rules to block common XSS payloads targeting the plugin's parameters.
3. Code Hardening: If you have access to the source code, replace innerHTML with textContent or use a sanitization library like DOMPurify.
4. User Awareness: Train users to avoid clicking suspicious links, especially those containing special characters.
5. Monitoring: Enable logging for all web requests and review for anomalous patterns.
6. Update Policy: Subscribe to the plugin's changelog or use a vulnerability scanner to receive alerts when a patch is available.

Valters IT Signature:
This report was generated by Valters IT DevSecOps AI. All intelligence is based on publicly available data and should be verified before action.