Unauthenticated PHP Object Injection in Micdrop <= 1.3.1

Executive Summary

CVE-2026-39580 is a high-priority PHP Object Injection vulnerability found in the WordPress Micdrop Theme versions 1.3.1 and below.

This flaw allows attackers to inject malicious PHP objects without needing to authenticate, potentially leading to code execution, SQL injection, path traversal, denial of service, and other harmful actions if a suitable POP (Property Oriented Programming) chain exists.

The vulnerability is serious, with a CVSS score of 8.1, and is classified under OWASP Top 10 A3: Injection.

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Impact Analysis

Exploitation of this vulnerability can lead to severe impacts including remote code execution, unauthorized access to or manipulation of the database via SQL injection, unauthorized file system access through path traversal, and denial of service attacks.

These impacts can compromise the confidentiality, integrity, and availability of your website and its data, potentially leading to data breaches, service outages, and loss of user trust.

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Mitigation Strategies

Immediate action is recommended to mitigate this vulnerability.

• Update the WordPress Micdrop Theme to version 1.4 or later, where the vulnerability is patched.
• Apply mitigation measures provided by Patchstack to block attacks until the update can be applied.

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Compliance Impact

The vulnerability allows unauthenticated PHP Object Injection, which can lead to code execution, SQL injection, path traversal, and denial of service. Such impacts can compromise the confidentiality, integrity, and availability of data.

This type of vulnerability can negatively affect compliance with standards like GDPR and HIPAA, which require protection of personal and sensitive data against unauthorized access and breaches.

Exploitation could result in data breaches or service disruptions, potentially leading to violations of these regulations and associated legal or financial penalties.

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Detection Guidance

The vulnerability affects WordPress sites using the Micdrop theme version 1.3.1 or below. Detection involves identifying if your system is running this vulnerable theme version.

To detect the presence of the vulnerable Micdrop theme on your WordPress installation, you can check the theme version by inspecting the theme files or using WP-CLI commands.

• Use WP-CLI to list installed themes and their versions: wp theme list
• Manually check the style.css file in the Micdrop theme directory (usually wp-content/themes/micdrop/) for the version number.

For network detection, monitor HTTP requests for suspicious payloads that could indicate PHP Object Injection attempts targeting the Micdrop theme, although no specific detection commands or signatures are provided.

Immediate mitigation involves updating the theme to version 1.4 or later or applying Patchstack's recommended mitigation measures.

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