FluentCart WordPress Plugin Subscription Manipulation Vulnerability

Executive Summary

This vulnerability is an Insecure Direct Object Reference (IDOR) flaw in the FluentCart WordPress plugin before version 1.4.0. It allows authenticated users to manipulate another customer's subscription without proper authorization by exploiting endpoints that fail to verify subscription ownership. Attackers can change payment methods, cancel, or rebind subscriptions if they know the target subscription's UUID.

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Detection Guidance

To detect this vulnerability, check if your FluentCart plugin version is below 1.4.0. Inspect network traffic for unauthorized POST requests to subscription endpoints that modify payment methods or cancel subscriptions without proper ownership verification. Look for logs showing 'Subscription not found' errors in GET requests but successful modifications in POST requests for the same subscription ID.

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Impact Analysis

If you use FluentCart versions prior to 1.4.0, an attacker with a valid account could access and modify your subscription details, such as changing payment methods or canceling subscriptions. This could lead to unauthorized charges, service disruptions, or loss of access to paid services.

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Compliance Impact

This vulnerability could violate compliance requirements under GDPR and HIPAA by exposing unauthorized access to sensitive customer data, such as payment information and subscription details. It undermines data integrity and access control principles required by these regulations.

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Mitigation Strategies

Immediately update the FluentCart plugin to version 1.4.0 or later. Review server logs for suspicious activity related to subscription modifications. Implement additional server-side checks to verify subscription ownership before processing any requests. Restrict access to sensitive endpoints and monitor for unauthorized changes.

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