Vulnerability · Published Mar 10, 2026 · Assigned by GitHub_M

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

Medium 5.4

In plain English

A medium-severity security flaw in webauthn-framework from web-auth. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 86.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	web-auth/webauthn-framework	5.2.4	GHSA-f7pm-6hr8-7ggm
Packagist	web-auth/webauthn-lib	5.2.4	GHSA-f7pm-6hr8-7ggm
Packagist	web-auth/webauthn-symfony-bundle	5.2.4	GHSA-f7pm-6hr8-7ggm

Affected products (as reported)

Vendor	Product	Versions
web-auth	webauthn-framework	< 5.2.4
web-auth	webauthn-lib	< 5.2.4
web-auth	webauthn-symfony-bundle	< 5.2.4

Weakness: CWE-346 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

References

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