CVE-2024-43240: Ultimate Membership Pro Auth Bypass Flaw

CVE-2024-43240 Overview

CVE-2024-43240 is an Improper Authentication vulnerability affecting the Ultimate Membership Pro plugin for WordPress, developed by wpindeed (azzaroco). This vulnerability allows unauthenticated attackers to bypass authentication mechanisms and escalate privileges on affected WordPress installations. The flaw exists in versions up to and including 12.7 of the plugin.

Critical Impact

Unauthenticated attackers can exploit this vulnerability to gain elevated privileges on vulnerable WordPress sites, potentially achieving full administrative access without any prior authentication.

Affected Products

• wpindeed Ultimate Membership Pro versions up to and including 12.7
• WordPress installations running the vulnerable indeed-membership-pro plugin
• Sites utilizing Ultimate Membership Pro for membership management functionality

Discovery Timeline

• 2024-08-19 - CVE-2024-43240 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2024-43240

Vulnerability Analysis

This vulnerability is classified as an Improper Authentication issue (CWE-287), which occurs when software does not perform any authentication for functionality that requires a valid user identity. In the context of Ultimate Membership Pro, the plugin fails to properly verify user identity before allowing access to privileged functionality.

The vulnerability enables unauthenticated privilege escalation, meaning attackers can gain elevated access rights without providing valid credentials. This type of flaw is particularly dangerous in membership plugins, which often handle user roles, access controls, and sensitive membership data.

The network-accessible attack vector combined with low complexity requirements makes this vulnerability highly exploitable. No user interaction is required for successful exploitation, and attackers do not need any prior privileges on the target system.

Root Cause

The root cause of CVE-2024-43240 lies in improper authentication controls within the Ultimate Membership Pro plugin. The plugin contains functionality that should require authenticated access but fails to properly verify user credentials before processing requests. This authentication bypass allows unauthenticated users to access privileged operations intended only for authenticated or administrative users.

Attack Vector

The attack vector for this vulnerability is network-based, allowing remote attackers to exploit vulnerable WordPress installations over the internet. The exploitation flow typically involves:

1. An attacker identifies a WordPress site running a vulnerable version of Ultimate Membership Pro
2. The attacker crafts malicious requests targeting the authentication bypass flaw
3. The plugin processes these requests without proper authentication verification
4. The attacker gains elevated privileges, potentially including administrative access

For detailed technical information about the exploitation mechanism, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2024-43240

Indicators of Compromise

• Unexpected user accounts with elevated privileges appearing in WordPress user management
• Suspicious login activity or session creation without corresponding authentication logs
• Unauthorized changes to membership plans, access levels, or user roles
• Anomalous HTTP requests targeting Ultimate Membership Pro plugin endpoints

Detection Strategies

• Monitor WordPress user creation and role modification events for unauthorized changes
• Implement web application firewall (WAF) rules to detect and block suspicious requests to the plugin
• Audit access logs for unusual patterns targeting /wp-content/plugins/indeed-membership-pro/ paths
• Deploy endpoint detection solutions capable of identifying post-exploitation activities

Monitoring Recommendations

• Enable detailed logging for WordPress user management activities
• Configure alerts for new administrator account creation or privilege modifications
• Monitor for unusual database queries related to user tables and membership data
• Implement file integrity monitoring for WordPress core and plugin files

How to Mitigate CVE-2024-43240

Immediate Actions Required

• Update Ultimate Membership Pro to a patched version beyond 12.7 immediately
• Audit existing WordPress user accounts for any unauthorized privilege escalations
• Review access logs for signs of exploitation attempts
• Consider temporarily disabling the plugin until patched if an update is not immediately available

Patch Information

Organizations should update the Ultimate Membership Pro plugin to the latest available version that addresses this vulnerability. Check the official plugin repository or vendor website for security updates. For detailed patch information, consult the Patchstack Vulnerability Report.

Workarounds

• Implement IP-based access restrictions to WordPress admin areas if possible
• Deploy a web application firewall with rules to block exploitation attempts
• Restrict access to membership plugin functionality through server-level configurations
• Consider using additional WordPress security plugins that provide authentication hardening

# Example: Restrict access to plugin directory via .htaccess
# Add to /wp-content/plugins/indeed-membership-pro/.htaccess
<Files "*.php">
    Order Deny,Allow
    Deny from all
    Allow from 127.0.0.1
</Files>