Flaw in Keycloak Allows Bypassing WebAuthn Policies

CVE-2026-8830

What is CVE-2026-8830?

A vulnerability identified in Keycloak allows authenticated users to bypass WebAuthn policies during credential registration through client-side JavaScript manipulation. The issue arises from the server-side processAction() not validating whether the new credential's parameters—such as public key algorithms—are compliant with the configured WebAuthn policies of the realm. This oversight could potentially facilitate the creation of credentials that do not meet the requisite administrative security standards, thereby undermining the system's overall security framework and permitting the usage of non-compliant authentication methods.

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