CVE-2026-43914

Name: CVE-2026-43914
Creator: NVD / NIST
Published: 2026-05-11T23:20:22.253+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2026-43914 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

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

9.8/10

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

EPSS Probability

0.29%

20.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-307

Affected Software

Vendor	Product	Versions
Dani-Garcia	Vaultwarden	< 1.35.4

References

https://github.com/dani-garcia/vaultwarden/pull/6867Issue Tracking, Patch
https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4Product, Release Notes
https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4gExploit, Patch, Vendor Advisory
https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4gExploit, Patch, Vendor Advisory

Timeline

Published: May 11, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-43914?

How severe is CVE-2026-43914?

CVE-2026-43914 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2026-43914?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-43914?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST