Executive Summary

CVE-2026-54806 is a high-priority PHP Object Injection vulnerability found in the WordPress WP Activity Log Plugin versions 5.6.3.1 and earlier.

This flaw allows unauthenticated attackers to inject malicious PHP objects into the application, potentially enabling them to execute arbitrary code or perform other harmful actions.

The vulnerability can be exploited without any authentication, making it especially dangerous.

Exploitation depends on the presence of a suitable Property-Oriented Programming (POP) chain, which attackers can use to carry out code injection, SQL injection, path traversal, denial of service, and other malicious activities.

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Impact Analysis

This vulnerability can have severe impacts including unauthorized code execution, data breaches, and service disruption.

• Attackers can inject malicious code leading to full system compromise.
• SQL injection could expose or manipulate sensitive data.
• Path traversal attacks might allow attackers to access restricted files.
• Denial of service attacks could disrupt website availability.

Because the vulnerability requires no authentication, it is likely to be exploited in widespread attacks targeting thousands of websites.

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Mitigation Strategies

The immediate step to mitigate this vulnerability is to update the WordPress WP Activity Log Plugin to version 5.6.4 or later, as this version contains the patch addressing the PHP Object Injection flaw.

If updating is not possible immediately, it is recommended to seek assistance from a hosting provider or web developer.

Additionally, Patchstack has issued a mitigation rule to block attacks targeting this vulnerability until the plugin can be updated.

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Detection Guidance

There is no specific information provided about detection commands or network/system detection methods for CVE-2026-54806 in the available resources.

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Compliance Impact

The vulnerability in the WP Activity Log plugin allows unauthenticated PHP Object Injection, which can lead to code injection, SQL injection, path traversal, denial of service, and other malicious activities.

Such exploitation could result in unauthorized access to sensitive data or disruption of services, potentially causing non-compliance with data protection regulations like GDPR and HIPAA that require safeguarding personal and health information.

Therefore, if exploited, this vulnerability could negatively impact compliance with common standards and regulations by exposing sensitive data or causing service interruptions.

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