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CVE-2026-27898— Vaultwarden: Unauthorized Access via Partial Update API on Another User’s Cipher

Quick assessment

Affected
dani-garcia vaultwarden
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vaultwarden是Daniel García个人开发者的一个用 Rust 编写的 Bitwarden 服务器 API 的替代实现。 Vaultwarden 1.35.4之前版本存在安全漏洞，该漏洞源于经过身份验证的普通用户可指定其他用户的cipher_id并调用部分更新端点，可能导致暴露密文详细信息。

CVSS 5.4 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1530.001
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I. Basic Information for CVE-2026-27898

Vulnerability Information
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Vulnerability Title
Vaultwarden: Unauthorized Access via Partial Update API on Another User’s Cipher
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Vaultwarden 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vaultwarden是Daniel García个人开发者的一个用 Rust 编写的 Bitwarden 服务器 API 的替代实现。 Vaultwarden 1.35.4之前版本存在安全漏洞，该漏洞源于经过身份验证的普通用户可指定其他用户的cipher_id并调用部分更新端点，可能导致暴露密文详细信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
dani-garcia vaultwarden < 1.35.4 -

II. Public POCs for CVE-2026-27898

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III. Intelligence Information for CVE-2026-27898

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Same Patch Batch · dani-garcia · 2026-03-04 · 4 CVEs total

CVE-2026-27802 8.3 HIGH Vaultwarden: Privilege Escalation via Bulk Permission Update to Unauthorized Collections b
CVE-2026-27803 8.3 HIGH Vaultwarden: Collection Management Operations Allowed Without `manage` Verification for Ma
CVE-2026-27801 Vaultwarden: 2FA Bypass on Protected Actions due to Faulty Rate Limit Enforcement

IV. Related Vulnerabilities

Same product: vaultwarden
Same vendor: dani-garcia
Same weakness: CWE-639

V. Comments for CVE-2026-27898

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