External risk intelligence

Attacker can run code on your site using FunnelFormsPro

CVE advisorySeverity: CRITICAL (CVSS 9.9)

CVE-2026-39440

A serious flaw in FunnelFormsPro allows attackers to run malicious code on your website, potentially leading to unauthorized control and data compromise. This issue is urgent due to its internet-facing nature.

4Halo Surface Signal

Code Injection

External exposure likelihood

Halo Surface Signal score for CVE-2026-39440

The vulnerability affects a WordPress plugin, which is a component of web applications. WordPress sites are typically deployed as internet-facing web applications to serve public traffic. Therefore, this component is commonly exposed to the public internet as part of the standard deployment pattern for such websites.

Horizon Alert

Summary of the vulnerability and why it matters

A code injection vulnerability in FunnelFormsPro could allow an attacker to include arbitrary code on your systems. This is a serious issue that could lead to unauthorized execution and control of your applications.

  • Remote attackers may cause issues.
  • It affects FunnelFormsPro.
  • This can lead to serious data compromise.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker can leverage this flaw by submitting specially crafted input to a vulnerable FunnelFormsPro instance. This could allow them to execute arbitrary code on the server, potentially leading to full system compromise.

  • Exploitable over the network.
  • Requires vulnerable plugin version.
  • User input can trigger code execution.

Live Threat

Current exploitation, exposure, and threat context

This critical vulnerability in FunnelFormsPro allows remote code inclusion, potentially enabling attackers to execute arbitrary code on affected systems. While the vulnerability is publicly disclosed, there is no current indication of widespread active exploitation or inclusion in threat intelligence feeds. The exact threat picture depends on the prevalence of the affected plugin version and the ease of developing a reliable exploit.

  • No KEV listing observed.
  • Public exploit details are limited.
  • Plugin is for WordPress sites.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

Prioritize blocking all inbound traffic to the FunnelFormsPro plugin and immediately begin reviewing logs for any signs of successful exploitation. If malicious activity is detected, isolate the affected systems to prevent further compromise.

  • Block network access to the plugin.
  • Monitor for exploitation attempts.
  • Investigate affected assets.

Frequently asked questions

What is FunnelFormsPro and what is its purpose?

FunnelFormsPro is a WordPress plugin designed for creating and managing website forms. It's utilized for various functions like generating leads, conducting customer surveys, and implementing interactive website elements.

What type of vulnerability is CVE-2026-39440 in FunnelFormsPro?

CVE-2026-39440 is a critical 'Improper Control of Generation of Code' vulnerability, also known as Code Injection. This weakness allows remote attackers to insert and execute arbitrary code on the server.

How can an attacker exploit the FunnelFormsPro vulnerability?

An unauthenticated attacker can exploit this flaw by sending specifically crafted input to a vulnerable FunnelFormsPro instance, enabling them to execute arbitrary code on the server.

What is the relevance of CVE-2026-39440 to internet-facing applications?

The vulnerability affects a WordPress plugin, a common component of web applications. WordPress sites are typically internet-facing, making this a relevant threat for publicly accessible websites that use the affected plugin version.

What are the recommended actions for addressing the FunnelFormsPro vulnerability?

It is recommended to block all inbound traffic to the FunnelFormsPro plugin immediately and review logs for any signs of exploitation. If malicious activity is found, isolate affected systems to prevent further compromise.

References