Authorization Bypass in Chatbot UI Retrieval Endpoint

Executive Summary

This vulnerability is an authorization bypass in the Chatbot UI application's retrieval endpoint. It allows authenticated attackers to access private file content belonging to other users by providing arbitrary file UUIDs. The endpoint uses a service-role Supabase client that bypasses row-level security and does not check file ownership, enabling attackers to retrieve indexed content chunks from victim files through crafted POST requests.

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Detection Guidance

To detect this vulnerability, monitor POST requests to the retrieval endpoint in Chatbot UI. Check for requests with arbitrary file UUIDs from authenticated users. Review Supabase logs for unauthorized access patterns or unusual file access events. Inspect network traffic for repeated requests to the retrieval API with varying file IDs.

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Impact Analysis

If you use Chatbot UI, an attacker with valid credentials could access your private files by exploiting this flaw. This could lead to unauthorized exposure of sensitive data, intellectual property, or confidential information stored in your files. The impact depends on the sensitivity of the files you store in the application.

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Compliance Impact

This vulnerability could lead to non-compliance with GDPR, HIPAA, and other privacy regulations. It enables unauthorized access to personal or sensitive data, violating confidentiality requirements. Organizations using Chatbot UI may face legal penalties, reputational damage, and loss of trust due to data breaches resulting from this flaw.

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Mitigation Strategies

Immediately update Chatbot UI to a patched version beyond commit hash 81328b61d2a4ab597a7a057be70e785cf756d9f8. Disable the retrieval endpoint if not essential. Implement strict file ownership validation in the API. Restrict service-role Supabase client permissions to prevent bypassing row-level security.

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