Vulnerability in Dani-Garcia Vaultwarden
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.003 (21.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Dani-Garcia Vaultwarden — versions < 1.35.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/dani-garcia/vaultwarden/security/advisories/GHSA-c5rv-q295-7w4g (Exploit, Patch, Vendor Advisory)
- github.com/dani-garcia/vaultwarden/pull/6867 (Patch, Issue Tracking)
- github.com/dani-garcia/vaultwarden/releases/tag/1.35.4 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-43914?
- CVE-2026-43914 is a high-severity vulnerability in Dani-Garcia Vaultwarden, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 7.3/10. Published 2026-05-11.
- How severe is CVE-2026-43914?
- High severity. CVSS v3 base score is 7.3 out of 10.
- Is CVE-2026-43914 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.