External risk intelligence

PHP Object Injection in Salesforce and Form Integration Plugin.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-49109

An unauthenticated PHP Object Injection vulnerability exists in a WordPress plugin that integrates contact forms with Salesforce and other builders. If reachable, this could allow attackers to inject malicious PHP objects, potentially leading to code execution. Confirming the plugin's use is critical to assessing risk.

4Halo Surface Signal

Deserialization

External exposure likelihood

Halo Surface Signal score for 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.

PCI scan relevance

PCI Relevance for CVE-2026-49109

Yes

CVE-2026-49109 — Halo PCI Relevance: Yes. Under typical PCI ASV external scan criteria, this issue may be flagged for scan prioritization.

This unauthenticated PHP Object Injection vulnerability affects popular WordPress form plugins and can lead to a critical compromise, requiring remediation before a PCI scan.

Scan-prioritization guidance only—not a PCI DSS certification or ASV attestation.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Priority actions

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.

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

Sources and related resources

Primary sources: NVD, CVE.org.

NVDPublished