CVE-2026-43914CRITICAL 9.8EPSS p20.3%

CVE-2026-43914CVE-2026-43914

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.

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.29% probability of exploitation · percentile 20.3% · 2026-06-19T12:03:05Z
Published2026-05-11
Last modified2026-05-13

Underlying weaknesses· 1

CWE-307

References

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

1

TypeTargetConfidenceTier
WeaknessImproper Restriction of Excessive Authentication Attemptscwe-3070%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.