Zipline Missing Authorization Lets Authenticated Users Modify Other Users' Files

Executive Summary

CVE-2025-71460 is a missing authorization vulnerability in Zipline before version 4.2.1. It allows authenticated users to modify or delete files belonging to other users by exploiting the /api/user/files/transaction endpoint. The issue occurs because the software fails to verify file ownership before processing requests.

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Detection Guidance

To detect this vulnerability, monitor API logs for unauthorized access attempts to the /api/user/files/transaction endpoint. Check for requests where users modify or delete files not owned by them. Use tools like curl to test the endpoint with known file IDs and verify if unauthorized changes occur.

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Impact Analysis

If you use Zipline before 4.2.1, an attacker with access to your system could edit or delete your files if they know the file ID. This could lead to data loss, unauthorized changes, or disruption of services. The risk requires network access and authentication but no additional privileges.

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Compliance Impact

This vulnerability could impact compliance with GDPR and HIPAA by allowing unauthorized access to or modification of sensitive data. GDPR requires protecting personal data integrity, while HIPAA mandates safeguarding protected health information. Unauthorized file changes may violate these regulations.

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Mitigation Strategies

Immediately upgrade Zipline to version 4.2.1 or later to patch the vulnerability. Ensure all users are authenticated and implement strict ownership verification for file operations. Review API logs for suspicious activity and restrict access to sensitive endpoints.

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