Unauthenticated PHP Object Injection in Hash Form

Executive Summary

This is an unauthenticated PHP Object Injection vulnerability in the WordPress Hash Form Plugin versions 1.4.1 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

Check for the presence of the Hash Form plugin version 1.4.1 or below in your WordPress installation. Use commands like 'wp plugin list' in WordPress CLI or inspect the plugin directory for version details. Monitor network traffic for unusual POST requests targeting the plugin.

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Impact Analysis

An attacker could exploit this to execute arbitrary code, steal sensitive data, modify database contents, or disrupt services. Since it requires no authentication, any unpatched instance is at high risk of compromise.

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Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Non-compliance may result in legal penalties or fines.

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Mitigation Strategies

Update the Hash Form plugin to version 1.4.2 immediately. If updating is not possible, apply the mitigation rule provided by Patchstack to block attacks until an update is applied. Disable the plugin if unused.

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