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CRITICAL severity

CVE-2021-38299 — webauthn-framework

CRITICALFix: web-auth/webauthn-framework@572e239

CVE-2021-38299 is a critical-severity (CVSS 9.8) Improper Authentication vulnerability in web-auth/webauthn-framework. A fix is available for web-auth/webauthn-framework — see the affected versions and patch details below.

Improper Access Control in Webauthn Framework

Also known asGHSA-6whf-q6p5-84wg
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 12, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs79th percentile — riskier than 79% of all scored CVEsHighest risk
0.05%0.80%1.55%2.30%0.5%1.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐘web-auth/webauthn-framework

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Webauthn Framework 3.3.x before 3.3.4 has Incorrect Access Control. An attacker that controls a user's system is able to login to a vulnerable service using an attached FIDO2 authenticator without passing a check of the user presence.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistweb-auth/webauthn-framework≥ 3.3.0&&< 3.3.43.3.4composer require web-auth/webauthn-framework:^3.3.4

Affected Products

2 products · 2 configurations
Application
webauthn frameworkspomky-labs
≥ 3.3.0 && < 3.3.4
range
Application
webauthn framworkspomky-labs
< 3.2.9
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for web-auth/webauthn-framework, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update web-auth/webauthn-framework to 3.3.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-38299 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

Webauthn Framework 3.3.x before 3.3.4 has Incorrect Access Control. An attacker that controls a user's system is able to login to a vulnerable service using an attached FIDO2 authenticator without passing a check of the user presence.
O3 Security · Impact-Aware SCA

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CVE-2021-38299: webauthn-framework — Fixed in 3.3.4