CVE-2025-47504: WooCommerce Custom Checkout Fields XSS Flaw

CVE-2025-47504 Overview

CVE-2025-47504 is a stored cross-site scripting (XSS) vulnerability in the WPFactory Custom Checkout Fields for WooCommerce plugin. The flaw affects all plugin versions up to and including 1.8.3. Attackers with low-privileged authenticated access can inject malicious script payloads that persist in the WordPress database. When rendered in an administrator or customer browser session, the payload executes in that user's security context. The vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation.

Critical Impact
Authenticated attackers can inject persistent JavaScript into WooCommerce checkout field configurations, enabling session hijacking, credential theft, and administrative account takeover when a privileged user views the affected page.

Affected Products

WPFactory Custom Checkout Fields for WooCommerce (plugin slug: custom-checkout-fields-for-woocommerce)
All versions from initial release through 1.8.3
WordPress sites running WooCommerce with this plugin installed and active

Discovery Timeline

2025-05-07 - CVE-2025-47504 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-47504

Vulnerability Analysis

The plugin fails to properly neutralize user-supplied input before storing it and rendering it in generated web pages. This produces a stored (persistent) XSS condition. An attacker submits crafted input containing HTML or JavaScript through a plugin-controlled interface. The payload is written to the database without adequate sanitization or escaping. When any user subsequently loads a page that renders the stored value, the browser interprets the payload as executable script.

Exploitation requires authenticated access with low privileges and some user interaction to trigger the payload. Because the vulnerability has a changed scope, script execution can affect users beyond the attacker's own account, including administrators. Successful exploitation allows an attacker to perform actions in the victim's browser session, exfiltrate session cookies, modify page content, or pivot toward account takeover.

Root Cause

The root cause is missing or insufficient output encoding and input sanitization in code paths that handle custom checkout field data. WordPress plugins should apply wp_kses_post(), esc_html(), esc_attr(), or esc_url() on values before rendering. The affected plugin does not consistently apply these routines for the vulnerable fields, allowing raw HTML and script tags to reach the DOM.

Attack Vector

The attack is delivered over the network against WordPress installations exposing the affected plugin. An authenticated attacker with low privileges submits a payload through a checkout field configuration or associated input surface. The payload persists in the database. A subsequent view by a higher-privileged user, such as a shop manager or administrator, triggers execution. Refer to the Patchstack Vulnerability Report for technical details.

Detection Methods for CVE-2025-47504

Indicators of Compromise

Presence of <script>, onerror=, onload=, or javascript: strings in WooCommerce checkout field configurations stored in the wp_options or wp_postmeta tables
Unexpected outbound HTTP requests from administrator browser sessions immediately after visiting WooCommerce settings pages
New or modified WordPress administrator accounts created shortly after an admin visited a checkout configuration page
Session cookies for the WordPress admin interface appearing in web server or proxy logs directed to unknown external hosts

Detection Strategies

Query the WordPress database for stored plugin option values containing HTML tag characters or common XSS sink keywords
Deploy a Web Application Firewall (WAF) rule that inspects POST requests to WooCommerce admin endpoints for script payloads
Enable Content Security Policy (CSP) reporting to surface inline script execution attempts on the WordPress admin dashboard
Compare the installed plugin version against 1.8.3 using WP-CLI: wp plugin list --name=custom-checkout-fields-for-woocommerce

Monitoring Recommendations

Log all POST and PUT requests to /wp-admin/admin.php and /wp-admin/admin-ajax.php when parameters reference custom-checkout-fields
Alert on WordPress administrator role changes, new user creation, and modifications to wp_users outside change windows
Monitor egress traffic from workstations used by WooCommerce administrators for connections to newly registered or low-reputation domains

How to Mitigate CVE-2025-47504

Immediate Actions Required

Update the Custom Checkout Fields for WooCommerce plugin to a version later than 1.8.3 as soon as the vendor publishes a fixed release
Audit existing checkout field configurations for injected HTML or JavaScript and remove any suspicious content
Rotate WordPress administrator passwords and invalidate active sessions if the plugin was in use before patching
Review WordPress user accounts for unauthorized additions or privilege escalations

Patch Information

Refer to the Patchstack Vulnerability Report for current patch availability and vendor guidance. Administrators should verify a fixed release exists before upgrading and validate the update in a staging environment.

Workarounds

Deactivate the Custom Checkout Fields for WooCommerce plugin until a patched version is installed
Restrict access to plugin configuration pages using role-based access controls and limit which accounts hold the manage_woocommerce capability
Apply a WAF rule that blocks requests containing HTML tag characters in parameters targeting the plugin's admin endpoints
Enforce a strict Content Security Policy on /wp-admin/ that disallows inline scripts and untrusted script sources

bash

# WP-CLI commands to inventory and disable the vulnerable plugin
wp plugin list --name=custom-checkout-fields-for-woocommerce --fields=name,status,version
wp plugin deactivate custom-checkout-fields-for-woocommerce

# Example nginx rule to block script payloads on plugin admin endpoints
location ~* /wp-admin/admin(-ajax)?\.php {
    if ($args ~* "(<script|onerror=|javascript:)") {
        return 403;
    }
}