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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-30964: 0.21% estimated exploitation activity in the next 30 days; percentile 11.13 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary When allowedorigins 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. Details CheckAllowedOrigins stores each configured allowed origin as: and later reduces the received clientDataJSON.origin the same way: If the reduced value matches, the method returns early. As a result, for the normal allowedorigins path, the later HTTPS check is not reached. This differs from WebAuthn Level 2, which requires verifying that C.origin matches the RP's origin (scheme + host + port), separately from verifying that authData.rpIdHash matches the expected RP ID. Affected code: - CheckAllowedOrigins.php Spec references: - §7.1 Registering a New Credential - §7.2 Verifying an Authentication Assertion - CollectedClientData.origin PoC Configuration: Send a registration or authentication response whose clientDataJSON.origin is:…

Published by the source

10 Mar 2026, 01:19 UTC

Last modified by the source

10 Mar 2026, 22:21 UTC

Source last checked

26 Oct 2026, 14:38 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-f7pm-6hr8-7ggm

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# Patch Next advisory brief: CVE-2026-30964

Advisory: Webauthn Framework: allowed_origins collapses URL-like origins to host-only values, bypassing exact origin validation
IDs: CVE-2026-30964, GHSA-f7pm-6hr8-7ggm
Record: https://patchnext.com/advisories/cve-2026-30964 (revision 1, source checked 26 Oct 2026, 14:38 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: web-auth/webauthn-symfony-bundle 5.2.4; web-auth/webauthn-lib 5.2.4; web-auth/webauthn-framework 5.2.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist web-auth/webauthn-symfony-bundle: affected >= 5.2.0, < 5.2.4; fixed in 5.2.4
- Packagist web-auth/webauthn-lib: affected >= 5.2.0, < 5.2.4; fixed in 5.2.4
- Packagist web-auth/webauthn-framework: affected >= 5.2.0, < 5.2.4; fixed in 5.2.4

## Suggested inspection (read-only)
- Packagist web-auth/webauthn-symfony-bundle: check the installed version with your package manager.
- Packagist web-auth/webauthn-lib: check the installed version with your package manager.
- Packagist web-auth/webauthn-framework: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on web-auth/webauthn-symfony-bundle, web-auth/webauthn-lib, web-auth/webauthn-framework.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-f7pm-6hr8-7ggm (GitHub-reviewed advisory GHSA-f7pm-6hr8-7ggm lists affected ranges: Packagist web-auth/webauthn-framework >=5.2.0 =5.2.0 =5.2.0 <5.2.4)

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