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Vulnerabilities

Vulnerability · CVE-2026-31835

Vaultwarden is a Bitwarden-compatible server written in Rust.

Published May 5, 2026 · catalog updated Jul 25, 2026 · Vaultwarden is a Bitwarden-compatible

Check if you run it

No confirmed exploitation is on record for CVE-2026-31835. EPSS is 0.19%. Act only if a listed version of Vaultwarden is a Bitwarden-compatible is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Vaultwarden is a Bitwarden-compatible).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.19%
Remediation
Version ranges on file
Affected products
cpe dani-garcia/vaultwarden · stated 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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe dani-garcia/vaultwardenversion unspecified
  • stated vaultwarden<= 1.35.4

How to fix CVE-2026-31835

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-31835. EPSS is 0.19%. Act only if a listed version of Vaultwarden is a Bitwarden-compatible is installed.

Which versions are affected?

Compare what you have installed with <= 1.35.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-345: Insufficient Verification of Data Authenticity. EPSS 0.19%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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

Sources

  • CVE.orgVulnerability recordCVE-2026-31835

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-31835

    30-day exploitation probability 0.2%

    first.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

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.