CVE-2026-46419: Yubico Webauthn-Server-Core

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Yubico webauthn-server-core (aka java-webauthn-server) 2.8.0 before 2.8.2 incorrectly checks a function's return value in the second factor flow, leading to impersonation.

Affected products

• Yubico Webauthn-Server-Core: from 2.8.0, before 2.8.2 (fixed in 2.8.2)

Published 2026-05-14. Last modified 2026-06-17.