CVE-2026-43914
published 2026-05-11CVE-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…
PriorityP359critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.29%
20.5th percentile
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
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| dani-garcia | vaultwarden | < 1.35.4 | 1.35.4 |
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No advisories linked to this vulnerability.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-43914 vaultwarden: Vaultwarden: Brute-force protection bypass via unprotected 2FA function allows unauthorized access [fedora-all]
bugzilla·2026-05-12·CVSS 7.3
CVE-2026-43914 [HIGH] CVE-2026-43914 vaultwarden: Vaultwarden: Brute-force protection bypass via unprotected 2FA function allows unauthorized access [fedora-all]
CVE-2026-43914 vaultwarden: Vaultwarden: Brute-force protection bypass via unprotected 2FA function allows unauthorized access [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-43914 vaultwarden: Vaultwarden: Brute-force protection bypass via unprotected 2FA function allows unauthorized access [epel-all]
bugzilla·2026-05-12·CVSS 7.3
CVE-2026-43914 [HIGH] CVE-2026-43914 vaultwarden: Vaultwarden: Brute-force protection bypass via unprotected 2FA function allows unauthorized access [epel-all]
CVE-2026-43914 vaultwarden: Vaultwarden: Brute-force protection bypass via unprotected 2FA function allows unauthorized access [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-43914 vaultwarden: Vaultwarden: Brute-force protection bypass via unprotected 2FA function allows unauthorized access
bugzilla·2026-05-11·CVSS 7.3
CVE-2026-43914 [HIGH] CVE-2026-43914 vaultwarden: Vaultwarden: Brute-force protection bypass via unprotected 2FA function allows unauthorized access
CVE-2026-43914 vaultwarden: Vaultwarden: Brute-force protection bypass via unprotected 2FA function allows unauthorized access
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.
2026-05-11
Published