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CVE-2026-43912

Dani-garcia Vaultwarden broken access control

8.7 HIGHPublic exploitEPSS 0.40%
  1. Published11 May 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Affected products

Dani-garcia Vaultwarden< 1.35.5

Remediation

Fixed in
Dani-garcia Vaultwarden≥ 1.35.5

References

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Frequently asked

Is CVE-2026-43912 being actively exploited?

CVE-2026-43912 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.40%.

How severe is CVE-2026-43912?

CVE-2026-43912 has a CVSS 3.1 base score of 8.7, rated high. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-43912?

Affected products include Dani-garcia Vaultwarden.

How do I fix CVE-2026-43912?

Upgrade affected software to a fixed version, for example Dani-garcia Vaultwarden 1.35.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.