CVE-2025-15147: WCFM Membership Auth Bypass Vulnerability

CVE-2025-15147 Overview

The WCFM Membership – WooCommerce Memberships for Multivendor Marketplace plugin for WordPress contains an Insecure Direct Object Reference (IDOR) vulnerability in all versions up to and including 2.11.8. The vulnerability exists in the WCFMvm_Memberships_Payment_Controller::processing function due to missing validation on a user-controlled key. This flaw allows authenticated attackers with Subscriber-level access or above to modify other users' membership payments, potentially leading to unauthorized financial manipulation within multivendor marketplace environments.

Critical Impact

Authenticated attackers can manipulate membership payment records of other users, potentially disrupting marketplace operations and enabling unauthorized access to paid membership features.

Affected Products

• WCFM Membership – WooCommerce Memberships for Multivendor Marketplace plugin versions ≤ 2.11.8
• WordPress sites running vulnerable versions of the WCFM Membership plugin
• WooCommerce multivendor marketplace implementations using affected WCFM Membership versions

Discovery Timeline

• 2026-02-10 - CVE CVE-2025-15147 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2025-15147

Vulnerability Analysis

This vulnerability is classified under CWE-639 (Authorization Bypass Through User-Controlled Key), commonly known as Insecure Direct Object Reference (IDOR). The flaw occurs in the membership payment processing functionality where the application fails to properly validate that the authenticated user has authorization to modify the targeted payment record.

The vulnerable code path allows any authenticated user with at least Subscriber-level privileges to directly reference and manipulate payment records belonging to other users. This occurs because the application accepts a user-controlled identifier for the payment record without verifying that the requesting user owns or has permission to modify that specific record.

The attack is network-accessible with low complexity and requires only basic authentication (Subscriber role), making it relatively easy for malicious actors to exploit. While the vulnerability does not allow direct data exfiltration or system compromise, it enables unauthorized modification of integrity-sensitive financial data within the membership system.

Root Cause

The root cause is insufficient authorization validation in the WCFMvm_Memberships_Payment_Controller::processing function. The application accepts user-supplied input to identify which payment record to process but fails to verify that the authenticated user has ownership or administrative privileges over that payment record. This missing access control check allows horizontal privilege escalation where users can modify resources belonging to other users at the same privilege level.

Attack Vector

The attack vector is network-based and requires an attacker to have an authenticated session with at least Subscriber-level access to the WordPress site. The attacker can manipulate the payment identifier parameter submitted to the vulnerable endpoint to reference payment records owned by other users. By changing this parameter value, the attacker can target and modify membership payments for arbitrary users on the platform.

The exploitation flow involves:

1. Attacker authenticates with a valid Subscriber or higher-level account
2. Attacker identifies the vulnerable payment processing endpoint
3. Attacker modifies the payment identifier parameter to target another user's payment
4. The application processes the request without proper authorization validation
5. The victim's payment record is modified according to the attacker's request

For technical implementation details, refer to the WordPress Plugin Code Review which shows the vulnerable code path at line 32 of the payment controller.

Detection Methods for CVE-2025-15147

Indicators of Compromise

• Unusual payment modification activity for users who did not initiate changes
• Audit log entries showing payment updates from IP addresses or sessions not associated with the payment owner
• Multiple payment record modifications occurring in rapid succession from a single authenticated session
• Subscriber-level accounts accessing payment processing endpoints for other users

Detection Strategies

• Implement logging for all payment modification requests, capturing the requesting user ID and the target payment record owner
• Monitor for mismatches between the authenticated user and the owner of modified payment records
• Deploy Web Application Firewall (WAF) rules to detect parameter manipulation attempts on payment endpoints
• Configure WordPress audit plugins to alert on payment record changes by non-administrative users

Monitoring Recommendations

• Enable comprehensive access logging for the WCFM Membership plugin endpoints
• Set up alerts for payment modifications where the authenticated user differs from the payment record owner
• Review payment audit trails regularly for anomalous patterns indicating exploitation attempts
• Monitor for unusual subscription status changes that could indicate payment manipulation

How to Mitigate CVE-2025-15147

Immediate Actions Required

• Update the WCFM Membership plugin to a version newer than 2.11.8 immediately
• Audit recent payment modifications to identify any unauthorized changes
• Review WordPress user accounts with Subscriber or higher access for suspicious activity
• Consider temporarily restricting access to payment functionality until patching is complete

Patch Information

The vulnerability has been addressed in versions beyond 2.11.8. The fix implements proper authorization validation to ensure users can only modify their own payment records. For details on the specific code changes, review the WordPress Changeset Update. Additional vulnerability intelligence is available in the Wordfence Vulnerability Report.

Workarounds

• Implement server-level access controls to restrict payment endpoint access to trusted IP addresses or admin users only
• Deploy a Web Application Firewall rule to validate payment request ownership before processing
• Temporarily disable the WCFM Membership payment processing functionality if immediate patching is not possible
• Reduce user privileges where possible, removing unnecessary Subscriber accounts until the patch is applied

# Configuration example - Add to wp-config.php to enable debug logging for suspicious activity
define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);
# Review /wp-content/debug.log for payment-related errors and access patterns