Unauthenticated Account Creation in Paid Memberships Pro

Executive Summary

This vulnerability affects the WordPress plugin Paid Membership Subscriptions before version 3.1.0. It allows unauthenticated users to create accounts without solving the reCAPTCHA challenge by omitting the reCAPTCHA field from the registration request. This bypasses the reCAPTCHA protection even if the site has it enabled.

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Detection Guidance

Check if the Paid Membership Subscriptions WordPress plugin version is below 3.1.0. Inspect registration requests to see if reCAPTCHA fields are being omitted without validation. Monitor for unusual account creations without reCAPTCHA challenges.

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Impact Analysis

Attackers can exploit this to create unauthorized accounts on your WordPress site, potentially leading to spam registrations, resource abuse, or unauthorized access to restricted content. It undermines user verification and could facilitate malicious activities.

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Compliance Impact

This vulnerability could potentially affect compliance with GDPR and HIPAA by allowing unauthorized account creation without proper verification. GDPR requires data protection measures to prevent unauthorized access, while HIPAA mandates strict controls over user access to protected health information. Bypassing reCAPTCHA may enable attackers to create accounts and access sensitive data without proper authentication.

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Mitigation Strategies

Update the Paid Membership Subscriptions plugin to version 3.1.0 or later immediately. Disable user registration temporarily if not required. Implement additional security measures like rate limiting or manual approval for new accounts.

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