Executive Summary

This vulnerability affects Vaultwarden, an unofficial Bitwarden compatible server. Before version 1.35.4, an authenticated regular user could specify another user's cipher_id and use the "PUT /api/ciphers/{id}/partial" endpoint. Although the standard retrieval API correctly denies access to that cipher, this partial update endpoint incorrectly returns a 200 OK response and exposes sensitive cipher details such as name, notes, data, and secureNote.

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Impact Analysis

This vulnerability can lead to unauthorized disclosure of sensitive information stored in other users' ciphers. An attacker with authenticated access could view confidential data like names, notes, and secure notes of other users, potentially leading to privacy breaches and data leakage.

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Compliance Impact

I don't know

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Detection Guidance

I don't know

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade Vaultwarden to version 1.35.4 or later, where the issue has been patched.

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