CVE-2026-43914

CriticalCVSS 9.8/10Last modified Oct 26, 2026

Description

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-307

Affected software

VendorProductVersions
dani-garciavaultwarden< 1.35.4

References

Timeline

Published
May 11, 2026
Last modified
Oct 26, 2026
NVD status
Analyzed

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CVE-2026-43914: Critical severity, CVSS 9.8 | Vulnix