CVE-2026-43914

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.

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CVSS v3.1 Score

7.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS — Exploit Prediction

0.0005

Probability of exploitation

0.15%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-307 CWE-307

Affected Products

Vendor	Product	Versions
dani-garcia	vaultwarden	< 1.35.4

References

Advisories & Patches

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

Exploits

https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g

Other References

https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4

Frequently Asked Questions

What is CVE-2026-43914? +

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. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-43914? +

CVE-2026-43914 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0005, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-43914? +

CVE-2026-43914 affects products from dani-garcia, specifically: vaultwarden. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-43914? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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