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CVE-2026-43914

7.3 · HIGH

Vaultwarden is a Bitwarden-compatible server written in Rust.

Published May 11, 2026CWE-307EPSS 0.49%

Overview

CVE-2026-43914 is a high-severity vulnerability. It was published on May 11, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/dani-garcia/vaultwarden/pull/6867GitHubgithub.com/dani-garcia/vaultwarden/releases/tag/1.35.4GitHubgithub.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4gGitHubgithub.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43914?

CVE-2026-43914 is a high-severity vulnerability. It was published on May 11, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-43914?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-43914?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43914?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43914 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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