What’s Vulnerable › Vulnerabilities

CVE-2026-30964: Webauthn Framework: allowed_origins collapses URL-like origins to host-only values, bypassing exact origin validation

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-10 · updated 2026-06-17
• Weakness: CWE-346

Description

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

How to fix

Upgrade to a fixed version: Spomky-Labs Webauthn-Lib 5.2.4; Spomky-Labs Webauthn-Symfony-Bundle 5.2.4; Spomky-Labs Webauthn Framwork 5.2.4. Check the vendor advisory for mitigations.

References

• https://github.com/web-auth/webauthn-framework/commit/535cc3c2dcbd9c3dfd5e00a254ad4a984e5e7839
• https://github.com/web-auth/webauthn-framework/commit/b4cd9a4394c35fcac6080fd2f84f4f58a30abc01
• https://github.com/web-auth/webauthn-framework/security/advisories/GHSA-f7pm-6hr8-7ggm
• https://github.com/web-auth/webauthn-framework/security/advisories/GHSA-f7pm-6hr8-7ggm

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