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.
Published: 2026-05-11
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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History

Fri, 15 May 2026 20:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:dani-garcia:vaultwarden:*:*:*:*:*:*:*:*

Tue, 12 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 12 May 2026 00:00:00 +0000

Type Values Removed Values Added
First Time appeared Dani-garcia
Dani-garcia vaultwarden
Vendors & Products Dani-garcia
Dani-garcia vaultwarden

Mon, 11 May 2026 22:30:00 +0000

Type Values Removed Values Added
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.
Title Vaultwarden: Cross-Org Group Binding Enables Unauthorized Read And Write Access Into Another Organization
Weaknesses CWE-285
References
Metrics cvssV3_1

{'score': 8.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N'}


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Dani-garcia Vaultwarden
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-12T13:19:50.689Z

Reserved: 2026-05-04T16:11:33.086Z

Link: CVE-2026-43912

cve-icon Vulnrichment

Updated: 2026-05-12T13:19:33.715Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-11T23:20:21.980

Modified: 2026-05-15T20:19:43.823

Link: CVE-2026-43912

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-12T00:15:07Z

Weaknesses