CVE-2026-62029 in WPFunnels Plugin
Summary
by MITRE • 10/09/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WPFunnels Team WPFunnels wpfunnels allows Stored XSS.This issue affects WPFunnels: from n/a through 3.13.3.
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Analysis
by VulDB Data Team • 10/09/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this vulnerability manifests as a Stored XSS within the WPFunnels plugin for WordPress, affecting versions ranging from n/a through 3.13.3. Unlike reflected XSS where malicious scripts are executed via immediate user interaction with a crafted link, stored vulnerabilities persist on the target server. In this context, an attacker can inject malicious JavaScript code into data fields that are subsequently saved to the application's database. When other users or administrators later view pages containing this tainted data, the browser executes the embedded script in their session context, leading to persistent compromise without further interaction from the initial attacker.
From a technical perspective, the root cause lies in insufficient input validation and output encoding mechanisms within the WPFunnels codebase. The application fails to properly sanitize user-supplied input before storing it or fails to encode that data appropriately when rendering it back into HTML responses. This oversight allows special characters such as angle brackets, quotes, and ampersands to pass through unaltered, enabling the injection of executable script tags. Because WPFunnels is a plugin designed for e-commerce funnel management on WordPress sites, it likely handles sensitive customer data, sales metrics, and configuration settings. The lack of robust sanitization in these areas creates multiple vectors where an attacker can plant persistent payloads that trigger upon page load or specific user interactions within the dashboard.
The operational impact of this vulnerability is severe due to its stored nature. Once a malicious payload is successfully injected, it remains active until manually removed from the database by an administrator. This persistence means that every subsequent visit to the affected page exposes users to potential attacks. Attackers can leverage this capability to steal session cookies, effectively hijacking administrative sessions and gaining full control over the WordPress installation. They may also perform actions on behalf of victims, such as modifying funnel configurations, altering product prices, or exfiltrating sensitive customer information including names, emails, and payment details. Furthermore, stored XSS is frequently used in phishing campaigns where attackers redirect users to malicious sites that mimic legitimate login pages, thereby compromising credentials across multiple services if password reuse occurs.
In terms of industry classification standards, this vulnerability aligns with CWE-79: Improper Neutralization of Input During Web Page Generation (Cross-site Scripting). The specific variant is categorized under Stored XSS, which poses a higher risk than reflected variants due to its persistence and broader potential impact on multiple users. From an offensive security framework perspective, such exploitation maps directly to the MITRE ATT&CK technique T1059: Command and Scripting Interpreter, specifically JavaScript execution within a browser environment. It also relates to TA0003 Persistence if the attacker uses the script to create backdoors or maintain access through modified configurations. The attack vector is typically classified as Network-based with low complexity but requires some level of initial interaction to inject the payload into the database fields.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. For organizations currently running affected versions, the primary action is to upgrade WPFunnels to version 3.14 or later where this vulnerability has been patched by implementing proper input sanitization and output encoding. If upgrading is not immediately feasible, administrators should manually audit database entries for suspicious script tags in funnel-related fields and remove any injected code. Additionally, deploying a Web Application Firewall can provide an additional layer of defense by filtering out common XSS patterns before they reach the application logic. It is also critical to enforce strict Content Security Policy headers that restrict inline script execution, thereby neutralizing many stored XSS payloads even if injection occurs. Regular security audits and penetration testing focused on input validation across all user-facing forms will help prevent similar vulnerabilities in future updates or related plugins.