CVE-2024-39652 in WooCommerce PDF Vouchers Plugin
Summary
by MITRE • 08/02/2024
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in WPWeb Elite WooCommerce PDF Vouchers allows Reflected XSS.This issue affects WooCommerce PDF Vouchers: from n/a before 4.9.5.
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Analysis
by VulDB Data Team • 01/28/2026
This vulnerability represents a critical cross-site scripting weakness in the WPWeb Elite WooCommerce PDF Vouchers plugin that enables attackers to execute malicious scripts in the context of a victim's browser. The flaw manifests as improper input neutralization during web page generation, specifically allowing reflected cross-site scripting attacks to occur. The vulnerability exists within the plugin's handling of user-supplied input parameters that are directly incorporated into dynamically generated web content without adequate sanitization or encoding measures. Attackers can craft malicious payloads that, when executed, will be reflected back to users browsing the affected WooCommerce store, potentially leading to session hijacking, data theft, or further exploitation of the compromised user's privileges. The vulnerability affects all versions of the plugin prior to version 4.9.5, indicating that users running older iterations remain exposed to this security risk.
The technical nature of this flaw aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities in web applications. This weakness occurs when web applications fail to properly validate or sanitize user input that is subsequently reflected back to users without appropriate encoding or escaping mechanisms. The reflected XSS pattern means that malicious scripts are injected into web pages through user-supplied parameters that are immediately reflected back to the user's browser. This type of vulnerability typically occurs when input data from HTTP request parameters, headers, or other sources is directly embedded into HTML output without proper contextual encoding or filtering. The attack vector is particularly dangerous in e-commerce environments where users may be browsing product pages or administrative interfaces, as it can lead to unauthorized access to sensitive customer data or administrative functions.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack chains that compromise entire user sessions and potentially provide attackers with elevated privileges within the WordPress environment. An attacker could exploit this vulnerability to steal user authentication cookies, redirect victims to malicious websites, or inject additional malicious content that could persist across multiple user interactions. The vulnerability is particularly concerning in WooCommerce environments where customer data is handled, as it could allow attackers to access sensitive information including order details, customer personal data, and potentially payment information. Additionally, the reflected nature of the vulnerability means that attackers can craft specific URLs or requests that will immediately execute malicious code upon page load, making detection and mitigation more challenging for system administrators.
Mitigation strategies for this vulnerability should prioritize immediate patching of the WooCommerce PDF Vouchers plugin to version 4.9.5 or later, which contains the necessary security fixes. Organizations should also implement comprehensive input validation and output encoding measures at multiple layers of their web application architecture, ensuring that all user-supplied data is properly sanitized before being incorporated into web page content. Network-based mitigations such as web application firewalls and security monitoring systems should be configured to detect and block suspicious input patterns that could indicate XSS attempts. Regular security audits and penetration testing of WordPress installations are essential to identify similar vulnerabilities in other plugins or themes. The implementation of Content Security Policy headers can provide an additional defense layer by restricting the sources from which scripts can be loaded, thereby limiting the potential impact of successful XSS attacks. System administrators should also consider implementing proper logging and monitoring of user interactions with the affected plugin to detect anomalous behavior that might indicate exploitation attempts.