Bug 2476359 (CVE-2026-43913)

Summary: CVE-2026-43913 vaultwarden: Vaultwarden: Organization-wide data loss due to unconfirmed owner's ability to purge vault
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Vaultwarden, a Bitwarden-compatible server. An authenticated user, who has been invited as an organization owner and accepted the invitation but has not yet been confirmed by an existing owner, can exploit this vulnerability. By calling a specific API endpoint, this user can bypass the confirmation check and purge the entire organization vault. This leads to immediate and irreversible organization-wide data loss, including all ciphers and attachments.
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Bug Depends On: 2476445, 2476446    
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Description OSIDB Bzimport 2026-05-11 23:06:04 UTC 
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.