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CVE-2026-43914

Dani-garcia Vaultwarden vulnerability

7.3 HIGHPublic exploitEPSS 0.49%
  1. Published11 May 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

Dani-garcia Vaultwarden< 1.35.4

Remediation

Fixed in
Dani-garcia Vaultwarden≥ 1.35.4

References

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Frequently asked

Is CVE-2026-43914 being actively exploited?

CVE-2026-43914 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.49%.

How severe is CVE-2026-43914?

CVE-2026-43914 has a CVSS 3.1 base score of 7.3, rated high. EPSS estimates a 0.49% probability of exploitation.

Which products are affected by CVE-2026-43914?

Affected products include Dani-garcia Vaultwarden.

How do I fix CVE-2026-43914?

Upgrade affected software to a fixed version, for example Dani-garcia Vaultwarden 1.35.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-43914 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.