External risk intelligence

PHP Object Injection in Salesforce and Form Integration Plugin.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-49109

This vulnerability affects a WordPress plugin designed to integrate contact forms with Salesforce. Such plugins are typically installed on public-facing websites to process user submissions, making the vulnerable endpoints commonly accessible via the public internet as part of standard web application deployment.

Deserialization

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns an unauthenticated PHP Object Injection vulnerability found in a WordPress plugin used for integrating contact form submissions with Salesforce and other form builders. Because the vulnerability can be exploited remotely without authentication, it presents a significant risk. The main concern is to confirm if this plugin is in use and if so, determine the potential exposure.

Remote code execution via web forms.
Confirms plugin usage and exposure.
Verify plugin use and assess risk.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker can exploit this vulnerability by sending a specially crafted request to a website that uses the affected plugin. This request targets the plugin's input processing, which fails to properly sanitize serialized PHP data. If successful, the attacker could inject arbitrary PHP objects into the application, potentially leading to the execution of malicious code.

No authentication required.
Triggered by crafted input.
Risk of remote code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could affect sensitive information processed by WordPress plugins that integrate with Salesforce and popular form builders. When these plugins are installed and configured to process user submissions, the vulnerability may allow unauthenticated attackers to inject malicious PHP objects, potentially leading to unauthorized access or manipulation of data.

System and user data could be exposed.
Injection occurs through unauthenticated requests.
Compromise of data integrity and confidentiality.

Operational Fix

Recommended remediation, mitigation, and detection steps

The integration plugin for Salesforce and popular WordPress form builders is likely managed by the website's application or platform team, with oversight from the security team regarding external exposure. The initial focus should be on identifying all instances of the affected plugin, confirming their public reachability and business criticality, and then engaging with the accountable owners to plan a coordinated response, prioritizing systems with the highest exposure.

Application or platform team owns remediation.
Verify plugin reachability and business impact.
Coordinate vendor updates and plan maintenance.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Free EASM Trial See How Signal Works

Frequently asked questions

What is the Integration for Salesforce and Contact Form 7 plugin?

It is a WordPress extension designed to bridge contact form data with Salesforce CRM. Administrators use it to automatically sync submissions from popular builders like WPForms, Elementor, and Ninja Forms directly into Salesforce, automating lead generation and data management for their websites.

How does CVE-2026-49109 work?

This vulnerability is a PHP Object Injection, categorized as CWE-502. It occurs when the plugin fails to safely handle serialized data provided in user inputs. By sending a malicious, specially formatted object to the site, an attacker can manipulate the application's internal data structures, which may lead to unauthorized code execution.

Do I need to be logged into WordPress to trigger this bug?

No. This vulnerability does not require authentication. An attacker can initiate the exploit by sending a crafted request to the vulnerable endpoint from any remote location. The issue is specifically tied to how the plugin processes incoming data; standard, legitimate form submissions that do not contain malicious serialized objects will not trigger the vulnerability.

Is my website at risk from this CVE?

Halo Surface Signal notes that since this plugin is designed for form submission processing, it is often installed on public-facing sites. If your WordPress site uses this plugin and is reachable via the internet, it is likely accessible to external attackers, increasing the relevance of this security concern.

What should I do if I run this plugin?

Start by auditing your WordPress environment to confirm if versions 1.4.3 or older are installed. Identify which sites use this integration for business operations. Once mapped, coordinate with your web administration or security team to restrict access or apply necessary updates, prioritizing public-facing systems where the risk of unauthenticated abuse is highest.

References

patchstack.com/database/wordpress/plugin/cf7-salesforce/vulnerabilit…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.