Auth bypass in Dani-Garcia Vaultwarden
CVE-2026-43913
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (19.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 19th percentile — 19.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Dani-Garcia Vaultwarden — versions < 1.35.5
Weakness classification (CWE)
References
- github.com/dani-garcia/vaultwarden/security/advisories/GHSA-937x-3j8m-7w7p (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-43913?
- CVE-2026-43913 is a high-severity vulnerability in Dani-Garcia Vaultwarden, classified under Incorrect Authorization. CVSS score: 8.1/10. Published 2026-05-11.
- How severe is CVE-2026-43913?
- High severity. CVSS v3 base score is 8.1 out of 10.