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CVE-2026-27803— Vaultwarden: Collection Management Operations Allowed Without `manage` Verification for Manager Role

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Manager对特定集合manage=false时仍可执行多项管理操作，可能导致权限问题。

CVSS 8.3 · High EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts
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I. Basic Information for CVE-2026-27803

Vulnerability Information
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Vulnerability Title
Vaultwarden: Collection Management Operations Allowed Without `manage` Verification for Manager Role
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, when a Manager has manage=false for a given collection, they can still perform several management operations as long as they have access to the collection. 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:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
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Manager对特定集合manage=false时仍可执行多项管理操作，可能导致权限问题。
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-2026-27803

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III. Intelligence Information for CVE-2026-27803

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Vendor Advisories for CVE-2026-27803 (1)

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-2026-27898 5.4 MEDIUM Vaultwarden: Unauthorized Access via Partial Update API on Another User’s Cipher
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-269

V. Comments for CVE-2026-27803

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