CVE-2026-27898
Vaultwarden: Unauthorized Access via Partial Update API on Another User’s Cipher
CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-639 |
| Vendor | dani-garcia |
| Product | vaultwarden |
| Published | Mar 4, 2026 |
| Last Updated | Mar 5, 2026 |
Stay Ahead of the Next One
Get instant alerts for dani-garcia vaultwarden
Be the first to know when new medium vulnerabilities affecting dani-garcia vaultwarden are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
dani-garcia / vaultwarden
< 1.35.4