Unauthenticated PHP Object Injection in Thrive Quiz Builder

Executive Summary

This is an unauthenticated PHP Object Injection vulnerability in the Thrive Quiz Builder WordPress plugin versions 10.9.3.0 and below. It allows attackers to inject malicious PHP objects without authentication, potentially leading to code execution, SQL injection, or other attacks if a suitable POP chain exists.

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Detection Guidance

Detecting this vulnerability requires checking if the Thrive Quiz Builder plugin version 10.9.3.0 or below is installed. Inspect WordPress installations for the plugin and verify the version. No specific commands are provided in the resources, but monitoring for unusual activity or failed exploit attempts may indicate compromise.

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Impact Analysis

This vulnerability can allow attackers to execute arbitrary code, manipulate databases, access sensitive files, or cause denial of service on affected websites. Since it is unauthenticated, any unpatched website using the vulnerable plugin is at risk of remote exploitation.

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Compliance Impact

This vulnerability could lead to data breaches, unauthorized access to personal data, or system compromise, which may violate GDPR, HIPAA, or other regulations requiring data protection and access controls. Exploitation could result in regulatory penalties due to compromised sensitive information.

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Mitigation Strategies

Immediately update the Thrive Quiz Builder plugin to version 10.9.3.1 or later. Apply Patchstack's provided mitigation rule to block attacks until the update is completed. Remove the plugin if not essential to reduce attack surface.

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