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.

Affected products

Bitwarden, Vaultwarden

Dani-garcia Vaultwarden

< 1.35.4

Fix

Available

CVSS 3.1

5.4 MEDIUM

EPSS

0.2% (6th percentile)

Weakness

CWE-639

NVD status

Analyzed

Published

2026-03-04

No exploit for CVE-2026-27898 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.