CVE-2026-43912
Vaultwarden: Cross-Org Group Binding Enables Unauthorized Read And Write Access Into Another Organization
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.
INFO
Published Date :
May 11, 2026, 11:20 p.m.
Last Modified :
Oct. 26, 2026, 6:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Vaultwarden to version 1.35.5.
- Verify the integrity of organization group relationships.
- Review access controls for group management endpoints.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43912.
| URL | Resource |
|---|---|
| https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-569v-845w-g82p | Exploit Mitigation Vendor Advisory |
| https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-569v-845w-g82p | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43912 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43912
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43912 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43912 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: vaultwarden de dani-garcia, Description: Vaultwarden es un servidor compatible con Bitwarden escrito en Rust. Antes de la versión 1.35.5, Vaultwarden no exige que una entrada groups_users.users_organizations_uuid pertenezca a la misma organización que groups.groups_uuid, o que una entrada collections_groups.collections_uuid pertenezca a la misma organización que collections_groups.groups_uuid. Múltiples puntos finales de gestión de grupos de organizaciones aceptan valores arbitrarios de MembershipId y CollectionId y los persisten directamente sin verificar la consistencia de la organización. Esto permite a un atacante que es Administrador en la Organización A, y solo un miembro con privilegios bajos en la Organización B, vincular su UUID de membresía de la Org B a un grupo de la Org A, y luego usar esa relación de grupo externa para obtener acceso no autorizado a los datos de la bóveda de la Org B. Con un grupo de la Org A con accessAll=true, el atacante puede hacer que /api/sync y /api/ciphers enumeren los cifrados de la Org B. Una vez que esos resultados de sincronización no autorizados revelan los ID de colección de la Org B, el atacante también puede vincular esos ID de colección externos al grupo de la Org A y convertir el mismo fallo en acceso de escritura sobre los elementos de la Org B. Esta vulnerabilidad está corregida en la versión 1.35.5. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'dani-garcia', 'product': 'vaultwarden', 'versions': [{'status': 'affected', 'version': '< 1.35.5'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-43912', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-12T13:19:47.074814Z'} -
Initial Analysis by [email protected]
May. 15, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:dani-garcia:vaultwarden:*:*:*:*:*:*:*:* versions up to (excluding) 1.35.5 Added Reference Type CISA-ADP: https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-569v-845w-g82p Types: Exploit, Mitigation, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-569v-845w-g82p Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 12, 2026
Action Type Old Value New Value Added Reference https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-569v-845w-g82p -
New CVE Received by [email protected]
May. 11, 2026
Action Type Old Value New Value 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. Added CVSS V3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N Added CWE CWE-285 Added Reference https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-569v-845w-g82p