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Fencer Vulns
medium 5.4

CVE-2026-30964 json

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

published 2026-03-10 8 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-10705 , GHSA-f7pm-6hr8-7ggm

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

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.

Patch / fix

  • packagist web-auth/webauthn-framework 5.2.4
  • packagist web-auth/webauthn-lib 5.2.4
  • packagist web-auth/webauthn-symfony-bundle 5.2.4
  • spomky-labs webauthn_framwork 5.2.4

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-30964 updated cvss 5.4

web-auth/webauthn-lib: web-auth/webauthn-lib: Origin validation bypass due to host component reduction

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/web-auth/webauthn-framework/security/advisories/GHSA-f7pm-6hr8-7ggm referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
packagist web-auth/webauthn-framework
>=5.2.0, <5.2.4
5.2.4
packagist web-auth/webauthn-lib
>=5.2.0, <5.2.4
5.2.4
packagist web-auth/webauthn-symfony-bundle
>=5.2.0, <5.2.4
5.2.4

Affected products

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

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.