CVE-2026-27898

Vaultwarden is an unofficial Bitwarden compatible server written in Rust, formerly known as bitwarden_rs. Prior to version 1.35.4, an authenticated regular user can specify another user’s cipher_id and call "PUT /api/ciphers/{id}/partial" Even though the standard retrieval API correctly denies access to that cipher, the partial update endpoint returns 200 OK and exposes cipherDetails (including name, notes, data, secureNote, etc.). This issue has been patched in version 1.35.4.

The following products are affected by CVE-2026-27898 vulnerability.

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Here, you will find a curated list of external links that provide in-depth information to CVE-2026-27898.

URL	Resource
https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-w9f8-m526-h7fh