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

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

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.

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

授权机制不恰当

Vaultwarden 授权问题漏洞

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

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