CVE-2026-97271 in WPFunnels Plugin
Summary
by MITRE • 09/30/2026
Unauthenticated Cross Site Scripting (XSS) in WPFunnels <= 3.13.1 versions.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified as an unauthenticated Cross-Site Scripting flaw within WPFunnels versions prior to or equal to 3.13.1 represents a critical security deficiency that allows attackers to inject malicious client-side scripts into web pages viewed by other users. This specific implementation of XSS is particularly severe because it does not require the attacker to possess valid credentials, thereby lowering the barrier for exploitation significantly and expanding the potential attack surface to include any visitor or user interacting with the affected WordPress site. The root cause typically lies in insufficient input validation and output encoding mechanisms within the plugin's handling of user-supplied data, such as form inputs, URL parameters, or HTTP headers, which are then rendered directly into HTML responses without proper sanitization.
From a technical perspective, this flaw aligns with CWE-79, commonly known as Improper Neutralization of Input During Web Page Generation, where the application fails to neutralize special characters that have meaning in the context of web browsers. When an unauthenticated user submits crafted input containing JavaScript code or event handlers, the server processes and stores this data without filtering it appropriately. Subsequently, when another user accesses a page that displays this stored content, their browser executes the injected script within the security context of the vulnerable website. This execution environment grants the malicious script access to sensitive cookies, session tokens, local storage, and potentially the ability to perform actions on behalf of the victim if they are authenticated to other services or administrative functions.
The operational impact of this vulnerability is substantial, as it facilitates a range of attacks including session hijacking, credential theft, defacement, and redirection to malicious sites. An attacker can exploit this flaw to steal administrator credentials by capturing cookies from users who have logged into the WordPress dashboard, potentially leading to full site compromise. Furthermore, because WPFunnels is often used for e-commerce funnel management, the impact extends to financial data integrity and customer trust if sensitive transactional information or user profiles are exposed through script injection. The unauthenticated nature of this vulnerability means that it can be exploited remotely by any internet-connected individual without prior interaction with an authenticated account, making it a high-risk issue according to standard severity scoring systems like CVSS.
In terms of industry frameworks, this vulnerability maps directly to the MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter: JavaScript, which describes how attackers use scripting languages to execute arbitrary code on target systems. It also relates to T1189 Drive-by Compromise if the script is designed to exploit browser vulnerabilities or download additional malware payloads upon execution by a victim's browser. The lack of authentication requirements places this in the initial access phase of an attack chain, allowing adversaries to establish a foothold within the application environment with minimal effort.
To mitigate this risk, immediate action must be taken to update WPFunnels to version 3.14 or later, where these input validation and output encoding issues have been addressed by the developers. In addition to updating the plugin, administrators should implement Web Application Firewall rules that detect and block common XSS payloads in HTTP requests. It is also advisable to enforce Content Security Policy headers on the web server to restrict the sources from which scripts can be loaded or executed, thereby limiting the impact of any successful injection attempts. Regular security audits and code reviews focusing on data sanitization practices are recommended to prevent similar vulnerabilities in custom themes or other plugins that interact with user input.