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

Quick assessment

Affected
web-auth webauthn-framework
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Webauthn Framework是Web-Authentication开源的一个身份验证机制。用于 Web 应用程序创建和使用强大的、经过证明的、有范围的、基于公钥的凭证，以便对用户进行强身份验证。 Webauthn Framework 5.2.4之前版本存在访问控制错误漏洞，该漏洞源于CheckAllowedOrigins对URL的验证不当，可能导致安全策略绕过。

CVSS 5.4 · Medium EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process
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I. Basic Information for CVE-2026-30964

Vulnerability Information
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Vulnerability Title
Webauthn Framework: allowed_origins collapses URL-like origins to host-only values, bypassing exact origin validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Webauthn Framework 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Webauthn Framework是Web-Authentication开源的一个身份验证机制。用于 Web 应用程序创建和使用强大的、经过证明的、有范围的、基于公钥的凭证，以便对用户进行强身份验证。 Webauthn Framework 5.2.4之前版本存在访问控制错误漏洞，该漏洞源于CheckAllowedOrigins对URL的验证不当，可能导致安全策略绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

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

II. Public POCs for CVE-2026-30964

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III. Intelligence Information for CVE-2026-30964

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Patches & Fixes for CVE-2026-30964 (2)

Vendor Advisories for CVE-2026-30964 (1)

IV. Related Vulnerabilities

Same product: webauthn-framework
Same vendor: web-auth
Same weakness: CWE-346