CVE-2026-46419 Auth bypass in webauthn-server-core
Attackers can impersonate users due to incorrect return value checks in the second factor flow of the Yubico WebAuthn server library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-46419?
CVE-2026-46419 is a high-severity authentication bypass vulnerability in Yubico webauthn-server-core, published on 14 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-253
Which versions are affected by CVE-2026-46419?
How do I fix CVE-2026-46419?
No fix has been published for CVE-2026-46419 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-46419 being exploited?
There is no known exploitation of CVE-2026-46419 in the wild and no public exploit code.
Sources
Also known as GHSA-wq52-w6cx-5mg2.