CVE-2025-15511: Rupantorpay WordPress Auth Bypass Flaw

CVE-2025-15511 Overview

The Rupantorpay plugin for WordPress contains an authorization bypass vulnerability due to a missing capability check on the handle_webhook() function. This security flaw affects all versions up to and including 2.0.0, enabling unauthenticated attackers to modify WooCommerce order statuses by sending crafted requests to the WooCommerce API endpoint.

Critical Impact

Unauthenticated attackers can manipulate WooCommerce order statuses without proper authorization, potentially leading to financial fraud, order manipulation, and business disruption for e-commerce sites using the vulnerable plugin.

Affected Products

• Rupantorpay WordPress Plugin versions up to and including 2.0.0
• WordPress sites with WooCommerce integration using the vulnerable plugin
• E-commerce stores utilizing Rupantorpay payment gateway functionality

Discovery Timeline

• 2026-01-28 - CVE-2025-15511 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2025-15511

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), which represents a fundamental access control flaw in the plugin's architecture. The handle_webhook() function processes incoming webhook requests from payment gateways but fails to verify that the requesting entity has the appropriate permissions to modify order data.

The vulnerability allows network-based attacks that require no authentication or user interaction. While the impact is limited to data integrity (order status modification), this can have significant business consequences for affected e-commerce operations, including fraudulent order fulfillment and revenue loss.

Root Cause

The root cause lies in the absence of a capability check within the handle_webhook() function located in the class-wc-rupantorpay-gateway.php file. WordPress plugins should implement proper authorization checks using functions like current_user_can() or verify webhook signatures to ensure that only legitimate requests can trigger order modifications. The vulnerable code at line 172 of the gateway class processes webhook data without validating the request source or the caller's authorization level.

Attack Vector

The attack vector is network-based and requires no authentication. An attacker can exploit this vulnerability by:

1. Identifying WordPress sites using the Rupantorpay plugin with WooCommerce integration
2. Crafting malicious webhook requests that mimic legitimate payment gateway callbacks
3. Sending these requests to the WooCommerce API endpoint
4. Manipulating order statuses (e.g., marking unpaid orders as completed)

The attack can be executed remotely without any user interaction, making it particularly dangerous for unmonitored e-commerce installations. Attackers could potentially exploit this to mark fraudulent orders as paid or cancel legitimate orders.

Detection Methods for CVE-2025-15511

Indicators of Compromise

• Unusual webhook requests to WooCommerce endpoints from unexpected IP addresses
• Anomalous order status changes without corresponding payment confirmations
• Log entries showing order modifications without authenticated user sessions
• Increased API traffic to the Rupantorpay webhook handler endpoint

Detection Strategies

• Monitor WordPress and WooCommerce access logs for suspicious POST requests to webhook endpoints
• Implement Web Application Firewall (WAF) rules to detect malformed or unauthorized webhook requests
• Review order audit trails for status changes that lack corresponding payment gateway transaction records
• Deploy endpoint detection solutions to identify anomalous patterns in e-commerce transaction flows

Monitoring Recommendations

• Enable detailed logging for WooCommerce order status changes and API requests
• Set up alerts for order modifications that occur outside of normal business patterns
• Implement real-time monitoring of webhook endpoint activity with threshold-based alerting
• Regularly audit order histories to identify potential unauthorized modifications

How to Mitigate CVE-2025-15511

Immediate Actions Required

• Update the Rupantorpay plugin to a patched version if available from the vendor
• If no patch is available, consider temporarily disabling the plugin until a fix is released
• Implement additional WAF rules to restrict webhook endpoint access to known payment gateway IP ranges
• Review recent order history for any unauthorized status modifications

Patch Information

Site administrators should check for updates to the Rupantorpay plugin through the WordPress plugin repository. Additional vulnerability details and remediation guidance can be found in the Wordfence Vulnerability Report. The vulnerable code can be reviewed in the WordPress Plugin Code Repository.

Workarounds

• Restrict access to the webhook endpoint via .htaccess or server-level configuration to only allow requests from legitimate payment gateway IP addresses
• Implement a custom capability check wrapper around the vulnerable function if direct code modification is feasible
• Use a security plugin like Wordfence to add an additional authorization layer for API endpoints
• Consider using a different payment gateway plugin until a patched version of Rupantorpay is available

# Example .htaccess configuration to restrict webhook endpoint access
# Add to WordPress root .htaccess file
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{REQUEST_URI} ^/wc-api/rupantorpay [NC]
    RewriteCond %{REMOTE_ADDR} !^203\.0\.113\.0$
    RewriteCond %{REMOTE_ADDR} !^198\.51\.100\.0$
    RewriteRule .* - [F,L]
</IfModule>
# Replace IP addresses with actual payment gateway IPs