CVE-2026-31835— Vaultwarden WebAuthn credential metadata tampered before signature verification
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I. Basic Information for CVE-2026-31835
Vulnerability Information
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Vulnerability Title
Vaultwarden WebAuthn credential metadata tampered before signature verification
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对数据真实性的验证不充分
Source: NVD (National Vulnerability Database)
Vulnerability Title
Vaultwarden 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vaultwarden是Daniel García个人开发者的一个用 Rust 编写的 Bitwarden 服务器 API 的替代实现。 Vaultwarden 1.35.4及之前版本存在数据伪造问题漏洞，该漏洞源于WebAuthn认证流程中在签名验证前更新凭据元数据，可能导致WebAuthn双因素认证持久拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| dani-garcia | vaultwarden | < 1.35.5 | - |
II. Public POCs for CVE-2026-31835
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|---|
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- Release 1.35.5 · dani-garcia/vaultwarden · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-31835
IV. Related Vulnerabilities
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Vaultwarden: Privilege Escalation via Bulk Permission Update - CVE-2026-27801
Vaultwarden: 2FA Bypass on Protected Actions due to Faulty R
Same vendor: dani-garcia
- CVE-2026-33420
Vaultwarden missing authorization check allows Manager-role - CVE-2026-27898
Vaultwarden: Unauthorized Access via Partial Update API on A - CVE-2026-27803
Vaultwarden: Collection Management Operations Allowed Withou - CVE-2026-27802
Vaultwarden: Privilege Escalation via Bulk Permission Update - CVE-2026-27801
Vaultwarden: 2FA Bypass on Protected Actions due to Faulty R
Same weakness: CWE-345
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V. Comments for CVE-2026-31835
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