Mailster <= 4.1.17 Arbitrary File Upload

Executive Summary

This vulnerability is an arbitrary file upload issue in the WordPress Mailster Plugin versions 4.1.17 and below. It allows attackers with Editor or Developer privileges to upload malicious files, such as backdoors, to a website. The flaw was patched in version 4.1.18.

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Detection Guidance

Check if the Mailster plugin version is 4.1.17 or below. Look for unexpected file uploads in the WordPress uploads directory. Use security plugins to scan for malicious files or unusual activity.

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Impact Analysis

Attackers could exploit this to upload malicious files, potentially gaining control of your website. Such attacks are often used in mass campaigns targeting thousands of sites. Immediate update or mitigation is recommended.

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Compliance Impact

This vulnerability could lead to unauthorized file uploads, potentially exposing sensitive data. GDPR requires protecting personal data, and HIPAA mandates safeguarding health information. A breach via this flaw may result in non-compliance, legal penalties, or data exposure risks.

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Mitigation Strategies

Update the Mailster plugin to version 4.1.18 or later immediately. If updating is not possible, apply Patchstack's mitigation rule to block attacks until the update is applied.

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