External risk intelligence

WP Funnel Manager Object Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-52761

This vulnerability affects a WordPress plugin, which is typically deployed as part of an internet-facing web application. Since web plugins are designed to process external traffic and requests, the vulnerable surface is commonly reachable from the public internet in standard deployment patterns.

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

A critical vulnerability exists in the WP Funnel Manager plugin for WordPress, allowing for object injection through the deserialization of untrusted data. This could potentially lead to unauthorized control or disruption of affected systems. The primary concern at this time is to determine if this plugin is in use and exposed.

Plugin vulnerability allows unauthorized code execution.
Critical flaw impacts internet-facing websites.
Confirm plugin usage and exposure to assess risk.

Attack Path

How an attacker could exploit the issue

An attacker can exploit this vulnerability by sending specially crafted data over the network to the vulnerable WP Funnel Manager component. This allows them to inject malicious objects into the application. If successful, this could lead to the full compromise of the application and its underlying server.

Reachable via the network.
Triggers via untrusted data deserialization.
Leads to code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to inject malicious objects into the system, potentially leading to unauthorized code execution and manipulation of the plugin's behavior when supported by the advisory.

User data and system files could be compromised.
Untrusted data could be deserialized by the plugin.
System integrity and service availability may be impacted.

Operational Fix

Recommended remediation, mitigation, and detection steps

In a typical WordPress deployment, the platform team or the application owner responsible for the WP Funnel Manager plugin should initiate the response. The first practical step is to identify all instances of the plugin, determine their business criticality, and confirm reachability from external networks before planning any remediation.

Platform or application owner.
Confirm plugin instances and business criticality.
Plan risk-based remediation and coordination.

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 Funnel Manager plugin?

WP Funnel Manager is a WordPress plugin designed to help site administrators track visitor paths, manage conversion funnels, and optimize sales flows within their websites. It functions as an integrated component that processes incoming web traffic to collect and analyze user interaction data.

What does deserialization of untrusted data mean for CVE-2025-52761?

This refers to a weakness class known as CWE-502, where the software takes data from an outside source and converts it into complex programming objects without proper validation. Because the plugin blindly trusts this incoming information, an attacker can manipulate the structure to insert malicious code or control the application's internal logic.

How can an attacker trigger this vulnerability?

An attacker triggers this by sending a specially crafted request containing malicious serialized data to the vulnerable plugin over the network. It is important to note that this does not require a logged-in user or administrative privileges; the plugin processes the input automatically, which is what makes it accessible to unauthenticated remote actors.

Why should I be concerned if my site uses WP Funnel Manager?

According to Halo Surface Signal, this plugin is typically part of internet-facing web applications designed to handle public traffic. Because the vulnerable component is meant to process external requests, it is likely reachable from the public internet, placing your entire server at risk of compromise if this flaw is targeted.

Is there a first step I should take to protect my system?

Begin by auditing your WordPress environment to identify every instance where WP Funnel Manager is installed. Once you have a complete inventory, assess which sites are internet-facing and determine the business criticality of those specific installations to prioritize your next steps for risk management.

References

patchstack.com/database/Wordpress/Plugin/wp-funnel-manager/vulnerabi…

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.