CVE-2025-66131: Yaad Sarig Payment Gateway Auth Bypass

CVE-2025-66131 Overview

CVE-2025-66131 is a Missing Authorization vulnerability affecting the Yaad Sarig Payment Gateway For WC WordPress plugin. This broken access control flaw allows attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to sensitive payment gateway functionality and data.

The vulnerability stems from CWE-862 (Missing Authorization), where the plugin fails to properly verify user permissions before allowing access to protected resources or functions.

Critical Impact

Unauthenticated attackers can exploit this broken access control vulnerability to gain unauthorized access to payment gateway functionality, potentially compromising transaction data confidentiality and integrity.

Affected Products

• Yaad Sarig Payment Gateway For WC plugin version 2.2.10 and earlier
• WordPress sites using the yaad-sarig-payment-gateway-for-wc plugin
• WooCommerce installations with this payment gateway integration

Discovery Timeline

• 2025-12-16 - CVE-2025-66131 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-66131

Vulnerability Analysis

This vulnerability represents a significant authorization bypass in the Yaad Sarig Payment Gateway For WC WordPress plugin. The flaw exists because certain plugin functions lack proper capability checks or nonce verification, allowing users without appropriate permissions to access restricted functionality.

In WordPress plugin development, authorization checks should be implemented using functions like current_user_can() to verify that users have the necessary capabilities before executing privileged operations. The absence of these checks in the affected plugin versions allows attackers to directly invoke sensitive functions.

Root Cause

The root cause is CWE-862 (Missing Authorization), which occurs when the software does not perform an authorization check when an actor attempts to access a resource or perform an action. In this case, the Yaad Sarig Payment Gateway plugin fails to verify whether the requesting user has the appropriate WordPress capabilities to access payment gateway configuration or transaction data.

This type of vulnerability commonly arises when:

• AJAX endpoints lack proper capability verification
• REST API routes are exposed without authentication requirements
• Admin-only functions can be called by unauthenticated users
• Nonce verification is missing or improperly implemented

Attack Vector

The vulnerability is exploitable over the network without requiring authentication or user interaction. An attacker can craft malicious requests to the WordPress site hosting the vulnerable plugin to access functionality that should be restricted to administrators or authenticated users only.

The attack surface includes:

• Direct requests to vulnerable AJAX handlers
• Manipulation of plugin-specific endpoints
• Bypassing intended access controls to view or modify payment configuration

Since the vulnerability requires no privileges and can be exploited remotely, the attack complexity is low, making it particularly dangerous for e-commerce sites processing payments.

Detection Methods for CVE-2025-66131

Indicators of Compromise

• Unusual access patterns to plugin-specific AJAX endpoints or admin pages
• Unexpected modifications to WooCommerce payment gateway settings
• Unauthorized API calls to payment gateway configuration functions
• Access log entries showing requests to plugin endpoints from unauthenticated sessions

Detection Strategies

• Review WordPress access logs for requests to /wp-admin/admin-ajax.php with plugin-specific action parameters
• Monitor for changes to payment gateway configuration options in the WordPress database
• Implement web application firewall (WAF) rules to detect and block exploitation attempts
• Use WordPress security plugins to audit access control violations

Monitoring Recommendations

• Enable detailed logging for WooCommerce and payment gateway activities
• Set up alerts for administrative changes to payment settings from non-admin users
• Monitor the wp_options table for unauthorized modifications to plugin settings
• Review user activity logs for privilege escalation attempts

How to Mitigate CVE-2025-66131

Immediate Actions Required

• Update the Yaad Sarig Payment Gateway For WC plugin to a patched version if available
• Temporarily disable the plugin if no patch is available and it is not critical to operations
• Implement WAF rules to restrict access to sensitive plugin endpoints
• Review recent access logs for signs of exploitation
• Audit current payment gateway configuration for unauthorized changes

Patch Information

Check the Patchstack Vulnerability Report for the latest patch information and remediation guidance. Users should upgrade to a version higher than 2.2.10 once a security patch is released by the plugin developer.

Until a patch is available, consider implementing additional access controls at the server or WAF level.

Workarounds

• Restrict access to WordPress admin and AJAX endpoints using .htaccess or server configuration rules
• Implement IP whitelisting for payment gateway administration functions
• Use a WordPress security plugin to add additional authorization checks
• Consider temporarily switching to an alternative payment gateway until the vulnerability is patched

# Example .htaccess rules to restrict plugin access
<FilesMatch "admin-ajax\.php">
    Order deny,allow
    Deny from all
    # Allow specific trusted IPs
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</FilesMatch>