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CVE-2026-43912— Vaultwarden: Cross-Org Group Binding Enables Unauthorized Read And Write Access Into Another Organization

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 1.35.5之前版本存在授权问题漏洞，该漏洞源于未强制groups_users.users_organizations_uuid条目属于与groups.groups_uuid相同的组织，或collections_groups.collections_uuid条目属于与collections_groups.groups_uuid相同的组织，多个组织

CVSS 8.7 · High EPSS 0.40% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
dani-garcia vaultwarden < 1.35.5 affected
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I. Basic Information for CVE-2026-43912

Vulnerability Information
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Vulnerability Title
Vaultwarden: Cross-Org Group Binding Enables Unauthorized Read And Write Access Into Another Organization
Source: CVE Program / CVE List V5
Vulnerability Description
Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, Vaultwarden does not enforce that a groups_users.users_organizations_uuid entry belongs to the same organization as groups.groups_uuid, or a collections_groups.collections_uuid entry belongs to the same organization as collections_groups.groups_uuid. Multiple organization group-management endpoints accept arbitrary MembershipId and CollectionId values and persist them directly without verifying org consistency. This lets an attacker who is Admin in Organization A, and only a low-privileged member in Organization B bind their Org B membership UUID into an Org A group, then use that foreign group relationship to gain unauthorized access to Org B vault data. With an accessAll=true Org A group, the attacker can make /api/sync and /api/ciphers enumerate Org B ciphers. Once those unauthorized sync results reveal Org B collection IDs, the attacker can also bind those foreign collection IDs to the Org A group and turn the same flaw into write access over Org B items. This vulnerability is fixed in 1.35.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Vaultwarden 授权问题漏洞
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 1.35.5之前版本存在授权问题漏洞，该漏洞源于未强制groups_users.users_organizations_uuid条目属于与groups.groups_uuid相同的组织，或collections_groups.collections_uuid条目属于与collections_groups.groups_uuid相同的组织，多个组织
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 < 1.35.5 -

II. Public POCs for CVE-2026-43912

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III. Intelligence Information for CVE-2026-43912

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Vendor Advisories for CVE-2026-43912 (1)

Same Patch Batch · dani-garcia · 2026-05-11 · 4 CVEs total

CVE-2026-43913 8.1 HIGH Vaultwarden: Unconfirmed Owner Can Purge Entire Organization Vault
CVE-2026-43914 7.3 HIGH Vaultwarden: Brute-force protection bypass vulnerability
CVE-2026-43911 6.8 MEDIUM Vaultwarden: Refresh tokens not invalidated on security stamp rotation

IV. Related Vulnerabilities

Same product: vaultwarden
Same vendor: dani-garcia
Same weakness: CWE-285

V. Comments for CVE-2026-43912

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