CVE-2021-38299

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-27 · updated 2026-06-17
Weakness: CWE-287

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 products

Spomky-Labs Webauthn Framwork: before 3.2.9; from 3.3.0 before 3.3.4 — fixed in 3.2.9, 3.3.4

How to fix

Upgrade to a fixed version: Spomky-Labs Webauthn Framwork 3.2.9, 3.3.4. Check the vendor advisory for mitigations.

References

https://github.com/web-auth/webauthn-framework/releases
https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2021-1-fehlende-ueberpruefung-von-user-presence-in-webauthn-framework/
https://github.com/web-auth/webauthn-framework/releases
https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2021-1-fehlende-ueberpruefung-von-user-presence-in-webauthn-framework/

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