Vulnerability Report

CVE-2026-27898

Title: Information Disclosure in Vaultwarden

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2026-27898.

CWE Category CWE-639

Published Date Mar 04, 2026

Modified Date Mar 06, 2026

Exploit Status Not Found

Score 5.4 CVSS v3.1

Exploit Probability (EPSS)

0.23%

Vulnerability Summary

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.

Impacted Vendors

dani-garcia 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.4

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-27898 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

March 06, 2026 MODIFIED

Vulnerability data updated via NVD.

March 06, 2026 MODIFIED

Vulnerability data updated via NVD.

March 05, 2026 MODIFIED

Vulnerability data updated via NVD.

March 04, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected Stack

No specific products linked.