What is CVE-2026-31835?

CVE-2026-31835 is a medium-severity vulnerability in Dani-garcia Vaultwarden, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.4/10. Published 2026-05-05.

How severe is CVE-2026-31835?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Dani-garcia Vaultwarden

CVE-2026-31835

Vaultwarden is a Bitwarden-compatible server written in Rust. In versions 1.35.4 and earlier, the WebAuthn authentication flow in `validate_webauthn_login()` updates persistent credential metadata (1backup_eligible1 and 1backup_state flags…

EPSS: 0.000 (11.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

Affected products

Dani-garcia Vaultwarden — versions < 1.35.5

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Product, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-31835?: CVE-2026-31835 is a medium-severity vulnerability in Dani-garcia Vaultwarden, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.4/10. Published 2026-05-05.
How severe is CVE-2026-31835?: Medium severity. CVSS v3 base score is 5.4 out of 10.