CVE-2026-46419

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-14 · updated 2026-10-26
Weakness: CWE-253

Description

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

How to fix

Upgrade to a fixed version: Yubico webauthn-server-core 2.8.2. Check the vendor advisory for mitigations.

References

https://github.com/Yubico/java-webauthn-server/releases/tag/2.8.2
https://www.yubico.com/support/security-advisories/ysa-2026-02/

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