CVE-2026-43914

HIGH 7.3

Vaultwarden: Brute-force protection bypass vulnerability

CVSS Score

7.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-307
Vendor	dani-garcia
Product	vaultwarden
Published	May 11, 2026
Last Updated	May 12, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Affected Versions

dani-garcia / vaultwarden

< 1.35.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g github.com: https://github.com/dani-garcia/vaultwarden/pull/6867 github.com: https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4