PHP Object Injection in Fluent Forms Pro Add On Pack

Executive Summary

The Fluent Forms Pro Add On Pack plugin for WordPress has a PHP Object Injection vulnerability in versions up to 6.2.6. This flaw allows authenticated attackers with Subscriber-level access or higher to inject a PHP Object through deserialization of untrusted input. If a POP chain exists, attackers can change user passwords and potentially take over administrator accounts. Exploitation requires user update integration to be enabled and a user meta field to be mapped.

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Detection Guidance

Check for unauthorized user account changes or new admin accounts in WordPress. Review server logs for suspicious PHP Object Injection patterns or deserialization attempts. Use WordPress security plugins to scan for vulnerable plugin versions.

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Impact Analysis

An attacker could exploit this to change user passwords, take over administrator accounts, and gain unauthorized access to the WordPress site. This could lead to data breaches, loss of sensitive information, or complete site compromise if the attacker escalates privileges.

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Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, which may violate GDPR (data protection) and HIPAA (health information privacy) requirements. Organizations could face legal penalties, reputational damage, and loss of customer trust if such breaches occur due to unpatched software.

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Mitigation Strategies

Update the Fluent Forms Pro Add On Pack plugin to the latest version. Disable user update integration if enabled. Remove any unauthorized admin accounts. Monitor user accounts for suspicious activity.

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