Unauthenticated IDOR in Review Schema Plugin

Executive Summary

This is an Insecure Direct Object Reference (IDOR) vulnerability in the Review Schema WordPress plugin versions 3.1.0 and below. It allows unauthenticated attackers to manipulate object IDs in URLs to access other users' data without proper authorization. The flaw stems from missing access controls on direct object references.

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Detection Guidance

To detect this IDOR vulnerability in the Review Schema plugin, check if your WordPress site is running version 3.1.0 or below. Inspect URLs for direct object references where user IDs or data IDs are exposed without proper authorization checks. Manually test by modifying IDs in URLs to see if unauthorized data is accessible.

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Impact Analysis

An attacker could exploit this to view or modify sensitive data belonging to other users, such as reviews, personal information, or settings. While the CVSS score indicates low severity, the impact depends on the data exposed. Users of affected versions should update immediately to mitigate risk.

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Compliance Impact

This IDOR vulnerability could lead to unauthorized access to personal data, violating GDPR's data protection principles or HIPAA's access controls. Organizations may face compliance penalties if user data is exposed due to insufficient access controls.

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Mitigation Strategies

Immediately update the Review Schema plugin to version 3.1.1 or later. Enable auto-updates for the plugin if using Patchstack. Review and restrict direct object references in URLs to ensure proper authorization checks are in place.

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