CVE-2026-31835

[CVE catalog]

Severity

High · CVSS 7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Published

Apr 26, 2026, 10:00:00 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.15% · Oct 25, 2026

A flaw was found in Vaultwarden. The WebAuthn authentication process in versions 1.35.4 and earlier incorrectly updates user credential information before fully verifying the authentication signature. This allows an attacker who possesses a user's password, but cannot complete the WebAuthn signature, to permanently alter the stored backup flags for that user's credentials. The unverified database update is not rolled back if signature verification fails, leading to a persistent denial of service for WebAuthn two-factor authentication for affected users. Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.