Incorrect Check of Function Return Value Affecting com.yubico:webauthn-server-core package, versions [2.6.0-alpha2,2.6.0-RC1)[2.7.0-alpha1,2.7.0-RC1)[2.8.0-alpha1,2.8.2)[2.9.0-alpha1,2.9.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JAVA-COMYUBICO-17235614
- published8 Jun 2026
- disclosed14 May 2026
- creditphilsmart
Introduced: 14 May 2026
CVE-2026-46419 (opens in a new tab)How to fix?
Upgrade com.yubico:webauthn-server-core to version 2.6.0-RC1, 2.7.0-RC1, 2.8.2, 2.9.0 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Check of Function Return Value in the "second factor" flow where FinishAssertionSteps fails to cross-check the verified credential handle against the requested username when a userHandle is not found for that username during the initial lookup. An attacker can gain unauthorized access by exploiting this flaw to impersonate another user.