CVE-2026-30964
MEDIUM
GHSA-f7pm-6hr8-7ggm
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Lifecycle Timeline
3Tags
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.
Analysis
The webauthn-lib PHP library before version 5.2.4 incorrectly validates origin restrictions by comparing only hostname components, allowing attackers to bypass authentication policies that rely on scheme or port differentiation. This enables an attacker to authenticate from origins that should be blocked, such as using HTTP instead of HTTPS or non-standard ports. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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External POC / Exploit Code
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