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CVE-2026-43914— Vaultwarden: Brute-force protection bypass vulnerability

Quick assessment

Affected
dani-garcia vaultwarden
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vaultwarden是Daniel García个人开发者的一个用 Rust 编写的 Bitwarden 服务器 API 的替代实现。 Vaultwarden 1.35.4之前版本存在安全漏洞，该漏洞源于如果启用电子邮件双因素认证，则允许绕过登录暴力破解保护，未受保护的双因素功能send_email_login也充当判断用户名密码组合是否正确的预言机，攻击者可滥用该端点无速率限制地暴力破解密码。

CVSS 7.3 · High EPSS 0.49% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
dani-garcia vaultwarden < 1.35.4 affected
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I. Basic Information for CVE-2026-43914

Vulnerability Information
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Vulnerability Title
Vaultwarden: Brute-force protection bypass vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Vaultwarden 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vaultwarden是Daniel García个人开发者的一个用 Rust 编写的 Bitwarden 服务器 API 的替代实现。 Vaultwarden 1.35.4之前版本存在安全漏洞，该漏洞源于如果启用电子邮件双因素认证，则允许绕过登录暴力破解保护，未受保护的双因素功能send_email_login也充当判断用户名密码组合是否正确的预言机，攻击者可滥用该端点无速率限制地暴力破解密码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
dani-garcia vaultwarden < 1.35.4 -

II. Public POCs for CVE-2026-43914

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III. Intelligence Information for CVE-2026-43914

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Patches & Fixes for CVE-2026-43914 (1)

Vendor Advisories for CVE-2026-43914 (1)

Vendor Pages for CVE-2026-43914 (1)

Same Patch Batch · dani-garcia · 2026-05-11 · 4 CVEs total

CVE-2026-43912 8.7 HIGH Vaultwarden: Cross-Org Group Binding Enables Unauthorized Read And Write Access Into Anoth
CVE-2026-43913 8.1 HIGH Vaultwarden: Unconfirmed Owner Can Purge Entire Organization Vault
CVE-2026-43911 6.8 MEDIUM Vaultwarden: Refresh tokens not invalidated on security stamp rotation

IV. Related Vulnerabilities

Same product: vaultwarden
Same vendor: dani-garcia
Same weakness: CWE-307

V. Comments for CVE-2026-43914

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