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CVE-2026-43914

Vaultwarden: Brute-force protection bypass vulnerability

Published: May 11, 2026Updated: May 13, 2026 Sources: CVE List NVDCWE-307
NVD MITRE
7.3CVSSHIGH
EPSS Score
0.3%
Top 79.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-307

Affected Products

vaultwardendani-garcia
On-prem
Security Products / identity-access-mgmt
dani-garciaoss-projectSecurity Productsaka vaultwarden

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Credential Access
View detailed technique mapping

References

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

Timeline

Published
May 11, 2026
Last Updated
May 13, 2026

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