CVE-2025-15400: Pix para Woocommerce Auth Bypass Flaw

CVE-2025-15400 Overview

CVE-2025-15400 is a Missing Authorization vulnerability (CWE-862) affecting the Pix para Woocommerce WordPress plugin through version 2.13.3. The vulnerability allows any authenticated user to trigger AJAX actions that reset payment gateway configuration options without proper capability or nonce checks. This permits low-privileged authenticated users, such as subscribers, to clear API credentials and webhook status, causing persistent disruption of OpenPix payment functionality.

Critical Impact

Authenticated attackers can completely disable payment processing functionality by resetting critical API credentials and webhook configurations, potentially causing significant business disruption and revenue loss for e-commerce sites.

Affected Products

• Pix para Woocommerce WordPress plugin version 2.13.3 and earlier
• WordPress sites using OpenPix payment gateway integration
• WooCommerce stores with Pix payment method enabled

Discovery Timeline

• 2026-02-11 - CVE CVE-2025-15400 published to NVD
• 2026-02-11 - Last updated in NVD database

Technical Details for CVE-2025-15400

Vulnerability Analysis

This vulnerability stems from improper access control in the Pix para Woocommerce WordPress plugin. The plugin exposes AJAX actions that handle sensitive payment gateway configuration operations but fails to implement proper authorization checks before processing these requests. Specifically, the plugin does not verify whether the authenticated user has the appropriate capabilities (such as manage_woocommerce or administrator role) to perform administrative operations, nor does it implement nonce verification to prevent unauthorized requests.

The vulnerability allows any authenticated WordPress user, including those with the minimal subscriber role, to invoke AJAX endpoints that reset payment gateway settings. This includes the ability to clear API credentials and webhook configurations that are essential for the OpenPix payment integration to function properly.

Root Cause

The root cause is a Missing Authorization vulnerability (CWE-862) in the AJAX action handlers. The plugin registers AJAX actions that modify sensitive payment configuration data but omits critical security checks:

1. Missing Capability Checks: The code does not call current_user_can() to verify the user has administrative privileges before processing configuration changes
2. Missing Nonce Verification: The handlers do not implement wp_verify_nonce() or check_ajax_referer() to validate request authenticity
3. Overly Permissive AJAX Registration: The AJAX actions are registered for all authenticated users via wp_ajax_ hooks without restricting access based on user roles

Attack Vector

The attack can be executed remotely over the network by any authenticated user. The attacker requires only minimal authentication (subscriber-level access) and no user interaction is needed. The attack flow involves:

1. An attacker creates or compromises a low-privilege WordPress account (e.g., subscriber)
2. The attacker identifies the vulnerable AJAX action endpoints
3. The attacker crafts and sends AJAX requests to reset payment gateway configuration
4. The plugin processes the requests without authorization checks, clearing API credentials and webhook settings
5. The OpenPix payment gateway becomes non-functional, disrupting all payment processing

The vulnerability can be exploited by sending specially crafted POST requests to the WordPress AJAX handler (/wp-admin/admin-ajax.php) with the appropriate action parameter targeting the vulnerable reset functionality.

Detection Methods for CVE-2025-15400

Indicators of Compromise

• Unexpected changes to WooCommerce payment gateway settings, particularly OpenPix/Pix configurations
• API credentials or webhook URLs being cleared without administrator action
• Unusual AJAX requests to admin-ajax.php from low-privilege user sessions
• Payment processing failures following suspicious admin-ajax activity

Detection Strategies

• Monitor WordPress audit logs for configuration changes to payment gateway settings
• Implement file integrity monitoring on WooCommerce configuration options in the database
• Review web server access logs for repeated POST requests to admin-ajax.php with payment-related action parameters
• Alert on payment gateway configuration changes that originate from non-administrator user sessions

Monitoring Recommendations

• Enable comprehensive logging for all WooCommerce payment gateway configuration changes
• Configure alerts for API credential modifications in payment plugins
• Monitor for subscriber or customer accounts accessing administrative AJAX endpoints
• Implement real-time detection for payment processing disruptions or configuration anomalies

How to Mitigate CVE-2025-15400

Immediate Actions Required

• Update the Pix para Woocommerce plugin to the latest patched version when available
• Review and audit all user accounts with any level of authentication to identify potential abuse
• Verify payment gateway configurations have not been tampered with and restore if necessary
• Consider temporarily restricting user registration or disabling subscriber-level accounts until patched

Patch Information

A security patch addressing this vulnerability should be available from the plugin developer. Administrators should monitor the WordPress plugin repository and the WPScan Vulnerability Report for update notifications. Until an official patch is released, implement the workarounds below to reduce exposure.

Workarounds

• Restrict WordPress user registration to prevent unauthorized account creation
• Remove or limit subscriber and customer role capabilities where possible
• Implement a Web Application Firewall (WAF) rule to block suspicious AJAX requests to payment-related actions
• Consider using a WordPress security plugin to add additional capability checks on sensitive AJAX handlers
• Regularly backup and monitor payment gateway configuration settings

# WordPress CLI commands to audit user roles and capabilities
# List all users with subscriber role who could exploit this vulnerability
wp user list --role=subscriber --format=table

# Verify current payment gateway settings are intact
wp option get woocommerce_openpix_settings

# Consider temporarily disabling user registration
wp option update users_can_register 0