Brute Force Affecting vaultwarden package, versions <1.35.4
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-VAULTWARDEN-16689343
- published14 May 2026
- disclosed12 May 2026
- creditRobert-Fl
Introduced: 12 May 2026
NewCVE-2026-43914 (opens in a new tab)How to fix?
Upgrade vaultwarden to version 1.35.4 or higher.
Overview
Affected versions of this package are vulnerable to Brute Force in the send_email_login process. An attacker can determine valid username and password combinations by abusing the /api/two-factor/send-email-login endpoint, which acts as an oracle and is not subject to rate-limiting. This allows repeated authentication attempts without triggering brute-force protection, even for users who do not have email 2FA configured.