Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD 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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
CVE-2026-31835 Unverified WebAuthn Metadata Update in Vaultwarden 1.35.4 and Earlier https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-31835
Post summary
The brief notice identifies CVE-2026-31835 as an unverified WebAuthn metadata update issue affecting Vaultwarden 1.35.4 and earlier, but it provides no PoC, exploit, patch, or active exploitation details.
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 … https://www.cve.org/CVERecord?id=CVE-2026-31835
Post summary
The text announces a WebAuthn authentication flaw in Vaultwarden versions 1.35.4 and earlier, specifying the vulnerable function and linking to the CVE record, without mentioning a PoC, exploit, or mitigation.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | dani-garcia | vaultwarden | - | - | - |