CVE-2026-27898
Medium
Description
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.
SeverityMedium
CVSS5.4
Exploit probability9. percentile0.2%
ProductDani-garcia Vaultwarden
PublishedMar 4, 2026
First seenMar 4, 2026
How to fix
Update
- dani-garcia vaultwarden1.35.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| dani-garcia vaultwarden | v < 1.35.4 | 1.35.4 |
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