CVE-2024-56265: WooCommerce PDF Vouchers XSS Vulnerability

CVE-2024-56265 Overview

CVE-2024-56265 is a reflected Cross-Site Scripting (XSS) vulnerability in the WooCommerce PDF Vouchers plugin developed by wpwebelite for WordPress. The flaw stems from improper neutralization of user-controlled input during web page generation [CWE-79]. Attackers can craft malicious URLs that execute arbitrary JavaScript in a victim's browser session when the victim clicks the link. The vulnerability affects all versions of the plugin up to and including 4.9.9. Because the scope is changed per the CVSS vector, successful exploitation can impact resources beyond the vulnerable component, including administrator sessions.

Critical Impact
Attackers can hijack authenticated sessions, perform actions on behalf of victims, or redirect users to attacker-controlled infrastructure by delivering a crafted link to a logged-in WordPress user.

Affected Products

WooCommerce PDF Vouchers plugin for WordPress
All versions from n/a through < 4.9.9
Vendor: wpwebelite

Discovery Timeline

2024-12-31 - CVE-2024-56265 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-56265

Vulnerability Analysis

The WooCommerce PDF Vouchers plugin fails to properly sanitize and encode user-supplied input before reflecting it back within HTTP responses. This missing neutralization allows an attacker to inject HTML and JavaScript payloads into rendered pages. Exploitation requires user interaction, typically clicking a specially crafted link. The scope change indicates that injected script can access resources outside the vulnerable plugin's security context, such as WordPress administrative functionality or authenticated session data. Successful exploitation compromises both confidentiality and integrity at a limited level, enabling account takeover chains or defacement.

Root Cause

The root cause is improper input validation and output encoding within request handlers exposed by the plugin. User-controlled parameters are echoed into HTML responses without contextual escaping. WordPress provides functions such as esc_html(), esc_attr(), and wp_kses() for safe rendering, but the vulnerable code paths do not consistently apply them. The issue is tracked under CWE-79: Improper Neutralization of Input During Web Page Generation.

Attack Vector

Exploitation is network-based and requires no authentication. An attacker crafts a URL containing a malicious payload targeting a vulnerable endpoint exposed by the plugin. The attacker then delivers this URL through phishing, malicious advertising, or embedded links on attacker-controlled sites. When a WordPress user (particularly an administrator) visits the link, the injected script executes in the browser under the site's origin. Refer to the Patchstack Vulnerability Report for additional technical details.

Detection Methods for CVE-2024-56265

Indicators of Compromise

HTTP requests to WooCommerce PDF Vouchers endpoints containing URL-encoded <script>, onerror=, onload=, or javascript: patterns
Referrer headers originating from unfamiliar external domains preceding administrator sessions
Unexpected outbound requests from browser sessions to attacker-controlled hosts following link clicks
New or modified WordPress administrator accounts created shortly after suspicious traffic

Detection Strategies

Inspect web server access logs for requests to plugin endpoints containing HTML or JavaScript metacharacters in query strings
Deploy Web Application Firewall (WAF) rules that flag reflected XSS payloads targeting /wp-content/plugins/woocommerce-pdf-vouchers/ paths
Enforce and monitor a Content Security Policy (CSP) to detect inline script violations reported via report-uri
Correlate suspicious URL clicks with subsequent privileged actions within WordPress audit logs

Monitoring Recommendations

Enable verbose logging on the WordPress instance and forward events to a centralized log platform for analysis
Alert on plugin version fingerprints matching 4.9.9 or earlier across your inventory
Monitor administrator account activity for changes in behavior following email or messaging campaigns

How to Mitigate CVE-2024-56265

Immediate Actions Required

Upgrade the WooCommerce PDF Vouchers plugin to a version later than 4.9.9 as soon as the vendor patch is confirmed installed
Audit WordPress administrator and shop manager accounts for unauthorized changes
Rotate credentials and invalidate active sessions for privileged users if suspicious activity is observed
Review recent order and voucher activity for signs of tampering

Patch Information

The vulnerability affects WooCommerce PDF Vouchers versions through < 4.9.9. Administrators should consult the vendor's changelog and the Patchstack Vulnerability Report to identify the fixed release and apply it through the WordPress plugin manager.

Workarounds

Temporarily deactivate the WooCommerce PDF Vouchers plugin if an immediate patch cannot be applied
Restrict access to WordPress administrative endpoints by source IP address using web server or WAF rules
Implement a strict Content Security Policy that disallows inline scripts to reduce the impact of reflected payloads
Train administrators to avoid clicking untrusted links while authenticated to the WordPress dashboard

bash

# Example nginx Content Security Policy header to reduce XSS impact
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; report-uri /csp-report" always;