External risk intelligence

WP Gravity Forms Keap/Infusionsoft Object Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-58636

The vulnerability affects a WordPress plugin designed to integrate Gravity Forms with Keap/Infusionsoft. WordPress plugins that handle form submissions and external CRM integrations are commonly deployed on internet-facing websites to capture user input, making the associated attack surface frequently reachable from the public internet.

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 details a critical vulnerability found in a WordPress plugin that connects Gravity Forms with Keap/Infusionsoft. The issue, known as deserialization of untrusted data, could allow an attacker to inject malicious code by manipulating data processed by the plugin. The main concern is confirming if this specific plugin is in use and, if so, understanding its potential exposure.

Plugin flaw allows malicious data injection.
Affects customer data and system integrity.
Confirm relevance and assess your exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted data over the network to a website using the affected plugin. This data would be processed by the plugin's deserialization function, leading to the injection of malicious objects. If successful, this could allow an attacker to execute arbitrary code on the server.

No authentication or user interaction required.
Triggered by sending malicious data over the network.
Allows arbitrary code execution on the server.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to inject malicious objects into a system through the WP Gravity Forms Keap/Infusionsoft plugin, potentially leading to unauthorized actions or data compromise. This occurs when the plugin deserializes untrusted data, impacting the service's integrity and confidentiality when supported.

Plugin data and system integrity at risk.
Untrusted data deserialization could occur.
Potential for unauthorized actions and data compromise.

Operational Fix

Recommended remediation, mitigation, and detection steps

For this vulnerability in the WP Gravity Forms Keap/Infusionsoft plugin, application owners and potentially the platform team are likely responsible for remediation. The first practical step is to identify all instances of the plugin, confirm their exposure and business criticality, and then assign ownership for planning remediation actions.

Assign ownership to plugin/application owners.
Verify plugin reachability and business criticality.
Plan remediation based on confirmed risk.

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.

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Frequently asked questions

What is the WP Gravity Forms Keap/Infusionsoft plugin?

It is a WordPress plugin designed to bridge Gravity Forms with the Keap/Infusionsoft customer relationship management platform. Users typically deploy it to automatically sync form entries—such as lead contact details—from their WordPress site directly into their CRM database, streamlining marketing and sales workflows.

What does deserialization of untrusted data mean for CVE-2025-58636?

This vulnerability, classified as CWE-502, occurs when the plugin takes data from an external source and reconstructs it into a programming object without proper validation. Because the plugin blindly trusts this input, an attacker can supply a malicious object that forces the server to execute unintended commands, effectively bypassing normal application logic.

How does an attacker trigger this vulnerability?

An attacker triggers the flaw by sending specially crafted, malicious data to the website over the network. The vulnerability does not require the attacker to have an account, nor does it require any specific interaction from a legitimate user. It is strictly a server-side processing error that occurs when the plugin handles the incoming data stream.

Is my website at risk from this CVE?

Halo Surface Signal indicates this is a high-priority concern for most users because WordPress plugins that manage form submissions and CRM integrations are almost always deployed on public-facing websites. If your site is reachable from the internet and runs the affected plugin, it serves as a potential entry point for attackers.

What are the first steps to address this plugin vulnerability?

Start by auditing your WordPress environment to create an inventory of all active plugins and confirm if this specific version (1.2.3 or earlier) is present. Once identified, document which business processes rely on it and coordinate with your site administrators to restrict its accessibility or prioritize its removal until a verified update is available.

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.