CVE-2024-43956: Memberpress Auth Bypass Vulnerability

CVE-2024-43956 Overview

CVE-2024-43956 is a missing authorization vulnerability in the Caseproof MemberPress plugin for WordPress. The flaw allows unauthenticated attackers to access functionality that is not properly constrained by access control lists (ACLs). The vulnerability affects MemberPress versions up to and including 1.11.34. The issue is tracked under CWE-862: Missing Authorization and is documented in the Patchstack Vulnerability Report.

Critical Impact
Unauthenticated remote attackers can invoke privileged MemberPress functionality on affected WordPress sites, compromising confidentiality, integrity, and availability of membership data.

Affected Products

Caseproof MemberPress plugin for WordPress
MemberPress versions from n/a through 1.11.34
WordPress sites running the vulnerable plugin in any configuration

Discovery Timeline

2024-11-01 - CVE-2024-43956 published to NVD
2026-04-28 - Last updated in NVD database

Technical Details for CVE-2024-43956

Vulnerability Analysis

The vulnerability stems from broken access control in the MemberPress plugin. One or more plugin endpoints execute privileged actions without verifying that the requesting user holds the required role or capability. Attackers reach the vulnerable functionality over the network without authentication or user interaction.

MemberPress manages paid memberships, subscriptions, and gated content on WordPress sites. Functionality protected by membership tiers or administrative roles becomes accessible when authorization checks are absent. Successful exploitation impacts the confidentiality, integrity, and availability of plugin-managed resources.

The public Patchstack advisory characterizes the issue as a broken access control flaw addressed in MemberPress 1.11.35. No public proof-of-concept is currently published, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Root Cause

The root cause is missing authorization logic on plugin handlers. The affected code paths fail to call WordPress capability checks such as current_user_can() or to validate nonces before performing sensitive operations. As a result, the plugin treats unauthenticated requests as legitimate, allowing them to invoke functionality intended only for administrators or paid members.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker crafts HTTP requests to the vulnerable plugin endpoints exposed by the WordPress site. Because the handlers omit authorization enforcement, the server processes the requests and executes privileged operations. Refer to the Patchstack Vulnerability Report for advisory-level technical context. No verified exploit code is publicly available.

Detection Methods for CVE-2024-43956

Indicators of Compromise

Unexpected HTTP POST or GET requests to MemberPress endpoints originating from unauthenticated sessions or unfamiliar IP ranges.
Modifications to MemberPress configuration, membership levels, or user records without a corresponding administrator login event in WordPress audit logs.
New or altered subscription, transaction, or coupon entries in the MemberPress database tables that lack a matching authenticated user action.

Detection Strategies

Inventory all WordPress installations and identify sites running MemberPress at version 1.11.34 or earlier using plugin management tooling.
Review web server access logs for anonymous requests targeting /wp-admin/admin-ajax.php and MemberPress REST routes with action parameters tied to administrative operations.
Correlate WordPress activity logs with MemberPress data changes to identify state modifications that occurred without an authenticated administrator session.

Monitoring Recommendations

Forward WordPress, web server, and WAF logs to a centralized analytics platform and alert on unauthenticated access to MemberPress endpoints.
Monitor for spikes in 200-status responses to MemberPress AJAX or REST URLs from single source IPs, which may indicate enumeration or abuse.
Track plugin version inventory continuously to confirm that patched releases remain deployed across the estate.

How to Mitigate CVE-2024-43956

Immediate Actions Required

Upgrade MemberPress to version 1.11.35 or later on every affected WordPress site without delay.
Audit MemberPress-managed data, including memberships, transactions, and user roles, for unauthorized changes since the plugin was first installed.
Rotate administrator credentials and invalidate active sessions on sites that show suspicious MemberPress activity.

Patch Information

Caseproof addressed the broken access control issue in MemberPress 1.11.35. The fix is referenced in the Patchstack Vulnerability Report. Apply the update through the WordPress plugin updater or by deploying the patched plugin archive from the vendor.

Workarounds

If immediate patching is not possible, restrict access to /wp-admin/admin-ajax.php and MemberPress REST routes at the web application firewall (WAF) for unauthenticated users.
Disable the MemberPress plugin on affected sites until the upgrade to 1.11.35 or later is applied.
Limit administrative interface exposure by enforcing IP allow-listing or VPN access in front of WordPress administrative endpoints.

bash

# Update MemberPress to the patched release using WP-CLI
wp plugin update memberpress --version=1.11.35
wp plugin list --name=memberpress --fields=name,status,version