CVE-2025-14971: WooCommerce Plugin Auth Bypass Flaw

CVE-2025-14971 Overview

The Link Invoice Payment for WooCommerce plugin for WordPress contains a missing authorization vulnerability (CWE-862) in the createPartialPayment and cancelPartialPayment functions. This flaw allows unauthenticated attackers to create partial payments on any order or cancel existing partial payments through ID enumeration, potentially disrupting e-commerce operations and financial records.

Critical Impact

Unauthenticated attackers can manipulate payment records on WooCommerce stores, creating fraudulent partial payments or canceling legitimate ones without any authentication requirements.

Affected Products

• Link Invoice Payment for WooCommerce plugin versions up to and including 2.8.0
• WordPress installations running vulnerable plugin versions
• WooCommerce stores utilizing the Link Invoice Payment functionality

Discovery Timeline

• 2026-01-27 - CVE-2025-14971 published to NVD
• 2026-01-27 - Last updated in NVD database

Technical Details for CVE-2025-14971

Vulnerability Analysis

This vulnerability stems from a missing capability check (authorization bypass) in the WordPress plugin's endpoint handling code. The affected functions createPartialPayment and cancelPartialPayment located in the WcPaymentInvoiceEndpoint.php file do not verify whether the requesting user has appropriate permissions before executing sensitive operations on order payment data.

WordPress plugins should implement capability checks using functions like current_user_can() to verify that users have appropriate permissions before allowing modifications to sensitive data. The absence of these checks means that any unauthenticated user can invoke these functions directly.

The network-accessible nature of WordPress REST API endpoints combined with the lack of authentication requirements creates a significant attack surface. Attackers can enumerate order IDs and partial payment IDs to systematically manipulate payment records across the entire WooCommerce installation.

Root Cause

The root cause is a missing authorization check (CWE-862) in the plugin's endpoint handler functions. The createPartialPayment function at line 179 and related functionality starting at line 19 in WcPaymentInvoiceEndpoint.php fail to verify user capabilities before processing requests. This architectural oversight allows unauthenticated REST API requests to modify order payment data without any permission validation.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by sending crafted HTTP requests to the vulnerable WordPress REST API endpoints. The attack methodology involves:

1. Identifying WordPress sites running the vulnerable plugin version
2. Enumerating valid order IDs through sequential requests
3. Sending requests to the createPartialPayment endpoint to inject fraudulent partial payment records
4. Alternatively, enumerating partial payment IDs and calling cancelPartialPayment to remove legitimate payment records

The vulnerability can be exploited by sending direct POST requests to the plugin's REST API endpoints. The lack of capability checks means the server processes these requests regardless of the user's authentication status, allowing manipulation of payment data for any order in the system.

Detection Methods for CVE-2025-14971

Indicators of Compromise

• Unexpected partial payment records appearing in WooCommerce orders
• Legitimate partial payments being cancelled without administrator action
• Unusual patterns of REST API requests targeting /wp-json/ endpoints related to invoice payments
• Sequential order ID access patterns in web server logs indicating enumeration attempts
• Payment record modifications without corresponding administrative user sessions

Detection Strategies

• Monitor WordPress REST API access logs for unauthenticated requests to invoice payment endpoints
• Implement Web Application Firewall (WAF) rules to detect and block suspicious sequential ID enumeration patterns
• Configure alerting for bulk modifications to partial payment records
• Review WooCommerce order audit logs for payment modifications without associated admin user activity

Monitoring Recommendations

• Enable detailed logging for WooCommerce payment-related activities
• Deploy endpoint detection solutions to monitor for plugin exploitation attempts
• Implement rate limiting on WordPress REST API endpoints to slow enumeration attacks
• Configure SentinelOne Singularity to detect anomalous web application behavior patterns

How to Mitigate CVE-2025-14971

Immediate Actions Required

• Update the Link Invoice Payment for WooCommerce plugin to a version newer than 2.8.0 that includes the security fix
• Audit existing WooCommerce orders for unauthorized partial payment modifications
• Review web server access logs for evidence of exploitation attempts
• Consider temporarily disabling the plugin until a patched version can be deployed

Patch Information

The vulnerability affects all versions of the Link Invoice Payment for WooCommerce plugin up to and including version 2.8.0. Site administrators should update to the latest available version that addresses this missing authorization vulnerability. Technical details about the vulnerable code can be reviewed in the WordPress Plugin Code Repository. Additional vulnerability intelligence is available from Wordfence.

Workarounds

• Implement server-level access controls to restrict access to the plugin's REST API endpoints to authenticated users only
• Deploy a Web Application Firewall (WAF) with rules to block unauthenticated requests to the vulnerable endpoints
• Use WordPress security plugins to add additional authentication layers to REST API access
• Consider disabling the plugin entirely if partial payment functionality is not critical to operations

# Apache .htaccess workaround to restrict access to plugin endpoints
# Add to WordPress root .htaccess file
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-json/.*invoice.*payment.* [NC]
RewriteCond %{HTTP:Authorization} ^$
RewriteRule .* - [F,L]
</IfModule>