SimpleWebAuthn: Registration verification does not sufficiently ensure that attestation certificates chain to a trust anchor — GHSA-6HXQ-P678-4HR2

Summary

## Summary `validateCertificatePath()` does not verify that an attestation's certificate chain actually terminates at a configured trust anchor. When walking the chain it stops at the first self-signed certificate it finds (which could be user-supplied), and exits early. This happens before the configured Apple/Google/etc trust anchor (which is concatenated to the end of the chain) is reached. A user can therefore…

Timeline

Published by source

2026-09-04

Risk context

• Reported severity or threat level: low.
• Reported CVSS score: 2 out of 10.
• Review exposure for the affected product or family: npm: @simplewebauthn/server.

Product

npm: @simplewebauthn/server

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source

Evidence and provenance

Canonical advisory ID

GHSA-6HXQ-P678-4HR2

Source

GitHub

Vendor

GitHub

Published by source

2026-09-04

Last source activity

2026-09-04

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.