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Findings

CVE-2026-31835

Vaultwarden is a Bitwarden-compatible server written in Rust.

Published May 5, 2026 · updated Jul 25, 2026 · dani-garcia vaultwarden

Vaultwarden is a Bitwarden-compatible server written in Rust. In versions 1.35.4 and earlier, the WebAuthn authentication flow in updates persistent credential metadata (1backup_eligible1 and 1backup_state flags1) based on unverified 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.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 5, 2026 · NIST NVD

    Detected

    Vaultwarden is a Bitwarden-compatible server written in Rust. In versions 1.35.4 and earlier, the WebAuthn authentication flow in updates persistent credential metadata (1backup_eligible1 and 1backup_state flags1) based on unverified 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 back

  2. Jul 25, 2026 · NIST NVD

    Updated

    Vaultwarden is a Bitwarden-compatible server written in Rust. In versions 1.35.4 and earlier, the WebAuthn authentication flow in updates persistent credential metadata (1backup_eligible1 and 1backup_state flags1) based on unverified 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 back

Affected

  • cpe dani-garcia/vaultwardenversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-31835

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-31835

    Vaultwarden is a Bitwarden-compatible server written in Rust. In versions 1.35.4 and earlier, the WebAuthn authentication flow in updates persistent credential metadata (1backup_eligible1 and 1backup_state flags1) based on unverified `authenticatorData

    nvd.nist.gov

References