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NVD CRITICAL: CVE-2026-43914 — Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.35.4, t...

·Source: NIST NVD

Updated:

Executive Summary

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

Analysis

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 Score: 7.3. Published: 2026-05-11T23:20:22.253.

Indicators of Compromise (1)

CVE (1)
CVE-2026-43914
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on May 11, 2026. Verified by: NIST.

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