CVE-2026-30964

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

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

web-auth · webauthn-framework · webauthn-lib · webauthn-symfony-bundle

CVSS v3.1 GITHUB

5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS

0.20% chance of exploitation in the next 30 days, 9th percentile

Published

2026-03-10

Proof-of-concept exploits (1)

• advisories/GHSA-f7pm-6hr8-7ggm

Security advisories

• web-auth/webauthn-framework/security/advisories/GHSA-f7pm-6hr8-7ggm
• web-auth/webauthn-framework/commit/535cc3c2dcbd9c3dfd5e00a254ad4a984e5e7839

References

• CVE Record
• NVD entry