CVE-2026-43914

CRITICAL EPSS 20.5%
Published May 11, 20261mo ago · Modified Jun 17, 20261w ago
9.8 CVSS 3.1
Critical
Find Similar
Published May 11, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
20.5% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-307

Affected Products 1

VendorProductVersionRange
dani-garciavaultwarden* <1.35.4

References 3

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

Remediation

  • github.com https://github.com/dani-garcia/vaultwarden/pull/6867
    Issue TrackingPatch
  • github.com https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g
    ExploitPatchVendor Advisory