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CVE-2026-43913

Dani-garcia Vaultwarden broken access control

8.1 HIGHPublic exploitEPSS 0.40%
  1. Published11 May 2026

Description

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.5, Vaultwarden allows an unconfirmed organization owner to purge the entire organization vault. The organization invite flow uses a two-step process: accepting an invite transitions membership from Invited to Accepted, and a separate confirmation by an existing owner upgrades it to Confirmed. The POST /api/ciphers/purge endpoint uses plain Headers and only checks that the membership type is Owner without verifying that the membership status is Confirmed. An authenticated user who has been invited as an organization owner and has accepted the invite and has not yet been confirmed can call this endpoint to hard-delete all ciphers and attachments in the organization, causing immediate organization-wide data loss. This vulnerability is fixed in 1.35.5.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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-2026-43913 being actively exploited?

CVE-2026-43913 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-2026-43913?

CVE-2026-43913 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-43913?

Affected products include Dani-garcia Vaultwarden.

How do I fix CVE-2026-43913?

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.