EUVD-2026-29342Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Brute-force protection bypass in Vaultwarden (the Rust Bitwarden-compatible server) before 1.35.4 lets unauthenticated remote attackers guess passwords without rate-limiting when email 2FA is enabled on the instance. The /api/two-factor/send-email-login endpoint (send_email_login in email.rs) is not covered by login rate-limiting yet still validates the username/password pair, turning it into a credential-validity oracle. The flaw affects all accounts on an instance that has email 2FA enabled — even users who never configured email 2FA themselves. Publicly available exploit code exists (SSVC 'poc'); EPSS is very low at 0.04% and it is not in CISA KEV, so no confirmed active exploitation.
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External POC / Exploit Code
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