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Vulnerability record · CVE-2026-43914 · published 11 May 2026

CVE-2026-43914: Dani-garcia vaultwarden improper restriction of authentication attempts vulnerability

DDani Garcia · Vaultwarden

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.

9.8 CVSS 3.1 Critical EPSS 0.49% · top 60.2% CWE-307 · Improper restriction of authentication attempts
9.8CVSS 3.1 base score
0.49%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/dani-garcia/vaultwarden/pull/6867 Issue TrackingPatch
https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4 ProductRelease Notes
https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g ExploitPatchVendor Advisory
https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g ExploitPatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-43914), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.