dani-garcia vaultwarden up to 1.35.4 WebAuthn Two-Factor Authentication validate_webauthn_login data authenticity

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in dani-garcia vaultwarden up to 1.35.4. Affected by this vulnerability is the function validate_webauthn_login of the component WebAuthn Two-Factor Authentication. The manipulation leads to data authenticity. This vulnerability is traded as CVE-2026-31835. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in dani-garcia vaultwarden up to 1.35.4 and classified as problematic. This issue affects the function validate_webauthn_login of the component WebAuthn Two-Factor Authentication. The manipulation with an unknown input leads to a data authenticity vulnerability. Using CWE to declare the problem leads to CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. Impacted is availability. The summary by CVE is:

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 flags1) based on unverified `authenticatorData` before signature validation is performed. An attacker who knows a user's password but cannot produce a valid WebAuthn signature can permanently modify the stored backup flags for that user's credential. If signature verification fails, the database update is not rolled back. This can result in a persistent denial of service of WebAuthn two-factor authentication for affected credentials. This issue has been fixed in version 1.35.5.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-31835 since 03/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available.

Upgrading to version 1.35.5 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-27424) and CERT Bund (WID-SEC-2026-1285). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Open Source Vaultwarden

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Data authenticity
CWE: CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: vaultwarden 1.35.5

Timelineinfo

03/09/2026 CVE reserved
05/05/2026 +56 days Advisory disclosed
05/05/2026 +0 days VulDB entry created
05/13/2026 +8 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-x7g7-cgx5-jhx2
Status: Confirmed

CVE: CVE-2026-31835 (🔒)
GCVE (CVE): GCVE-0-2026-31835
GCVE (VulDB): GCVE-100-361229
EUVD: 🔒
CERT Bund: WID-SEC-2026-1285 - Vaultwarden: Mehrere Schwachstellen

Entryinfo

Created: 05/05/2026 21:50
Updated: 05/13/2026 06:28
Changes: 05/05/2026 21:50 (69), 05/06/2026 15:57 (1), 05/13/2026 06:28 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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