Vulnerability-Lookup

CVE-2026-30964 (GCVE-0-2026-30964)

Vulnerability from cvelistv5 – Published: 2026-03-10 17:16 – Updated: 2026-03-10 17:57

Title

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

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.

Severity ?

5.4 (Medium)


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

CWE

CWE-346 - Origin Validation Error

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/web-auth/webauthn-framework/se…	x_refsource_CONFIRM
https://github.com/web-auth/webauthn-framework/co…	x_refsource_MISC
https://github.com/web-auth/webauthn-framework/co…	x_refsource_MISC

Impacted products

3 products

Vendor	Product	Version
web-auth	webauthn-framework	Affected: < 5.2.4
web-auth	webauthn-lib	Affected: < 5.2.4
web-auth	webauthn-symfony-bundle	Affected: < 5.2.4

Show details on NVD website

JSON

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FKIE_CVE-2026-30964

Vulnerability from fkie_nvd - Published: 2026-03-10 18:18 - Updated: 2026-05-07 18:35

Severity ?

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/web-auth/webauthn-framework/commit/535cc3c2dcbd9c3dfd5e00a254ad4a984e5e7839	Patch
security-advisories@github.com	https://github.com/web-auth/webauthn-framework/commit/b4cd9a4394c35fcac6080fd2f84f4f58a30abc01	Patch
security-advisories@github.com	https://github.com/web-auth/webauthn-framework/security/advisories/GHSA-f7pm-6hr8-7ggm	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/web-auth/webauthn-framework/security/advisories/GHSA-f7pm-6hr8-7ggm	Exploit, Vendor Advisory

Impacted products

Vendor	Product	Version
spomky-labs	webauthn-lib	*
spomky-labs	webauthn-symfony-bundle	*
spomky-labs	webauthn_framwork	*

JSON

To clipboard

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GHSA-F7PM-6HR8-7GGM

Vulnerability from github – Published: 2026-03-10 01:19 – Updated: 2026-03-10 22:21

Summary

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

Details

Summary

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.

Details

CheckAllowedOrigins stores each configured allowed origin as:

parse_url($allowedOrigin)['host'] ?? $allowedOrigin

and later reduces the received clientDataJSON.origin the same way:

parse_url($C->origin)['host'] ?? $C->origin

If the reduced value matches, the method returns early. As a result, for the normal allowed_origins 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:

webauthn:
  allowed_origins:
    - https://login.example.com:8443
  allow_subdomains: false

Send a registration or authentication response whose clientDataJSON.origin is:

https://login.example.com:9443

Observed: the response is accepted, because both values are reduced to login.example.com.

Expected: the response should be rejected, because https://login.example.com:8443 and https://login.example.com:9443 are different origins.

Impact

This is an origin validation error (CWE-346) affecting deployments that use allowed_origins. The most practical browser-facing scenario is same-host / different-port origin confusion. In non-browser or custom clients, scheme confusion may also be relevant.

Fix

Fixed in version 5.2.4 by rewriting CheckAllowedOrigins to perform full origin comparison (scheme + host + port) as required by the WebAuthn spec:

Origins configured with a scheme (e.g. https://example.com:8443) are now stored and compared as full scheme://host[:port] values, with default port normalization (443 for HTTPS, 80 for HTTP).
Origins configured without a scheme are still matched by host only, for backward compatibility.
Subdomain matching now also verifies scheme and port consistency.

See commit b4cd9a43.

Mitigation

Upgrade to web-auth/webauthn-framework (or web-auth/webauthn-lib / web-auth/webauthn-symfony-bundle) >= 5.2.4.

Severity ?

5.4 (Medium)


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

Show details on source website

JSON

To clipboard

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    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "web-auth/webauthn-lib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.2.0"
            },
            {
              "fixed": "5.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "web-auth/webauthn-symfony-bundle"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.2.0"
            },
            {
              "fixed": "5.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-30964"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-346"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-10T01:19:46Z",
    "nvd_published_at": "2026-03-10T18:18:55Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nWhen `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.\n\n### Details\n`CheckAllowedOrigins` stores each configured allowed origin as:\n\n```php\nparse_url($allowedOrigin)[\u0027host\u0027] ?? $allowedOrigin\n```\n\nand later reduces the received `clientDataJSON.origin` the same way:\n\n```php\nparse_url($C-\u003eorigin)[\u0027host\u0027] ?? $C-\u003eorigin\n```\n\nIf the reduced value matches, the method returns early. As a result, for the normal `allowed_origins` path, the later HTTPS check is not reached.\n\nThis differs from [WebAuthn Level 2](https://www.w3.org/TR/webauthn-2/), which requires verifying that `C.origin` matches the RP\u0027s origin (scheme + host + port), separately from verifying that `authData.rpIdHash` matches the expected RP ID.\n\n**Affected code:**\n- [CheckAllowedOrigins.php](https://github.com/web-auth/webauthn-framework/blob/d58906e/src/webauthn/src/CeremonyStep/CheckAllowedOrigins.php)\n\n**Spec references:**\n- [\u00a77.1 Registering a New Credential](https://www.w3.org/TR/webauthn-2/#sctn-registering-a-new-credential)\n- [\u00a77.2 Verifying an Authentication Assertion](https://www.w3.org/TR/webauthn-2/#sctn-verifying-assertion)\n- [CollectedClientData.origin](https://www.w3.org/TR/webauthn-2/#dom-collectedclientdata-origin)\n\n### PoC\nConfiguration:\n\n```yaml\nwebauthn:\n  allowed_origins:\n    - https://login.example.com:8443\n  allow_subdomains: false\n```\n\nSend a registration or authentication response whose `clientDataJSON.origin` is:\n\n```text\nhttps://login.example.com:9443\n```\n\n**Observed:** the response is accepted, because both values are reduced to `login.example.com`.\n\n**Expected:** the response should be rejected, because `https://login.example.com:8443` and `https://login.example.com:9443` are different origins.\n\n### Impact\nThis is an origin validation error (CWE-346) affecting deployments that use `allowed_origins`. The most practical browser-facing scenario is same-host / different-port origin confusion. In non-browser or custom clients, scheme confusion may also be relevant.\n\n### Fix\nFixed in version **5.2.4** by rewriting `CheckAllowedOrigins` to perform full origin comparison (scheme + host + port) as required by the WebAuthn spec:\n\n- Origins configured with a scheme (e.g. `https://example.com:8443`) are now stored and compared as full `scheme://host[:port]` values, with default port normalization (443 for HTTPS, 80 for HTTP).\n- Origins configured without a scheme are still matched by host only, for backward compatibility.\n- Subdomain matching now also verifies scheme and port consistency.\n\nSee commit [b4cd9a43](https://github.com/web-auth/webauthn-framework/commit/b4cd9a43).\n\n### Mitigation\nUpgrade to `web-auth/webauthn-framework` (or `web-auth/webauthn-lib` / `web-auth/webauthn-symfony-bundle`) **\u003e= 5.2.4**.",
  "id": "GHSA-f7pm-6hr8-7ggm",
  "modified": "2026-03-10T22:21:15Z",
  "published": "2026-03-10T01:19:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/web-auth/webauthn-framework/security/advisories/GHSA-f7pm-6hr8-7ggm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-30964"
    },
    {
      "type": "WEB",
      "url": "https://github.com/web-auth/webauthn-framework/commit/535cc3c2dcbd9c3dfd5e00a254ad4a984e5e7839"
    },
    {
      "type": "WEB",
      "url": "https://github.com/web-auth/webauthn-framework/commit/b4cd9a4394c35fcac6080fd2f84f4f58a30abc01"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/web-auth/webauthn-framework"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Webauthn Framework: allowed_origins collapses URL-like origins to host-only values, bypassing exact origin validation"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-30964 (GCVE-0-2026-30964)

FKIE_CVE-2026-30964

GHSA-F7PM-6HR8-7GGM

Summary

Details

PoC

Impact

Fix

Mitigation

Tags

Sightings

Nomenclature