CVE-2026-30964: Spomky-Labs Webauthn-Lib

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

web-auth/webauthn-lib is an open source set of PHP libraries and a Symfony bundle to allow developers to integrate that authentication mechanism into their web applications. Prior to 5.2.4, when allowed_origins is configured, CheckAllowedOrigins reduces URL-like values to their host component and accepts on host match alone. This makes exact origin policies impossible to express: scheme and port differences are silently ignored. This vulnerability is fixed in 5.2.4.

Affected products

• Spomky-Labs Webauthn-Lib: from 5.2.0, before 5.2.4 (fixed in 5.2.4)
• Spomky-Labs Webauthn-Symfony-Bundle: from 5.2.0, before 5.2.4 (fixed in 5.2.4)
• Spomky-Labs Webauthn Framwork: from 5.2.0, before 5.2.4 (fixed in 5.2.4)

Published 2026-03-10. Last modified 2026-06-17.