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CVE-2026-43914

critical

Vaultwarden is a Bitwarden-compatible server written in Rust.

Vendor / product: Dani-garcia — vaultwarden

Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.4, there is a security vulnerability in Vaultwarden that allows bypassing the login brute-force protection if email 2fa is enabled. If email 2fa is enabled, the unprotected 2fa-function send_email_login (email.rs, api endpoint /api/two-factor/send-email-login) also acts as an oracle determining whether a username-password combination is correct. An attacker can abuse that endpoint to brute-force passwords without rate-limiting. This works even for users who don't have email 2fa configured. This vulnerability is fixed in 1.35.4.

CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-05-11 23:20
Modified: 2026-10-26 18:10
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

dani-garcia / vaultwarden <1.35.4

Weakness classification (CWE)

CWE-307

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g
Vendor advisory: https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g
Patch / mitigation: https://github.com/dani-garcia/vaultwarden/pull/6867
Patch / mitigation: https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g
Patch / mitigation: https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g

References

Data sources

NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗

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Understanding CVEs and CVSS Scores