Subscriber Broken Authentication in MailMunch

Executive Summary

This is a Broken Authentication vulnerability in the MailMunch WordPress plugin versions 3.2.5 and below. It allows users with low-level access, like Subscriber privileges, to perform actions restricted to higher-privileged users, potentially leading to unauthorized admin access.

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Detection Guidance

Check if the MailMunch plugin version 3.2.5 or below is installed on your WordPress site. Review user activity logs for unauthorized actions performed by Subscriber-level accounts. Use security plugins like Patchstack to scan for exploitation attempts.

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Impact Analysis

Attackers could exploit this to gain unauthorized admin access to your WordPress site, even with minimal initial access. This could lead to full site compromise, data theft, or further attacks on your users or infrastructure.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive user data, violating compliance requirements under GDPR and HIPAA. Unauthorized admin access may result in data breaches, triggering legal penalties and reputational damage.

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Mitigation Strategies

Apply Patchstack's mitigation rule to block attacks. Update the MailMunch plugin to the latest version if available. Restrict Subscriber-level user permissions and monitor for suspicious activity. Consider temporary removal of the plugin if no patch is released.

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