Unknown · Vaultwarden · CVE-2026-43914
**Name of the Vulnerable Software and Affected Versions**
Vaultwarden versions prior to 1.35.4
**Description**
A flaw in the login brute-force protection allows attackers to determine if a username and password combination is correct when email two-factor authentication (2FA) is enabled. The API endpoint "/api/two-factor/send-email-login" and its associated function `send email login()` act as an oracle, enabling password brute-forcing without rate-limiting. This issue affects all users, including those who have not configured email 2FA.
**Recommendations**
Update to version 1.35.4.