CVE-2026-43914
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.29% probability · 21th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-307
- Affected
- dani-garcia/vaultwarden
- Source
- security-advisories@github.com
References
- https://github.com/dani-garcia/vaultwarden/pull/6867Issue Tracking, Patch
- https://github.com/dani-garcia/vaultwarden/releases/tag/1.35.4Product, Release Notes
- https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4gExploit, Patch, Vendor Advisory
- https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4gExploit, Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.