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.
Affected products
dani-garcia: vaultwarden
References4
- github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5r… ExploitPatchVendor Advisory
- github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5r… ExploitPatchVendor Advisory
- github.com/dani-garcia/vaultwarden/pull/6867 Issue TrackingPatch
- github.com/dani-garcia/vaultwarden/releases/tag/1.35.4 ProductRelease Notes
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 22 · as of 14 November 2026
- CWE
- CWE-307
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