CVE-2025-12150
Received Received - Intake

Attestation Bypass in Keycloak WebAuthn Enables Unauthorized Registration

Publication date: 2026-02-27

Last updated on: 2026-03-05

Assigner: Red Hat, Inc.

Description
A flaw was found in Keycloak’s WebAuthn registration component. This vulnerability allows an attacker to bypass the configured attestation policy and register untrusted or forged authenticators via submission of an attestation object with fmt: "none", even when the realm is configured to require direct attestation. This can lead to weakened authentication integrity and unauthorized authenticator registration.

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Meta Information

Published
2026-02-27
Last Modified
2026-03-05
Generated
2026-07-06
AI Q&A
2026-02-27
EPSS Evaluated
2026-07-05
NVD
CVE-2025-12150
EUVD
EUVD-2025-208135

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
redhat build_of_keycloak *
redhat keycloak 24.0.2
redhat build_of_keycloak to 26.4.4 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.

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Executive Summary

This vulnerability is a flaw in Keycloak's WebAuthn registration component that allows an attacker to bypass the configured attestation policy. Specifically, it enables the registration of untrusted or forged authenticators by submitting an attestation object with the format "none", even when the system is set to require direct attestation. This means attackers can register authenticators that should normally be rejected, weakening the authentication process.

Impact Analysis

The impact of this vulnerability is that it can weaken authentication integrity by allowing unauthorized authenticators to be registered. This could potentially enable attackers to gain unauthorized access by using forged or untrusted authenticators, thereby compromising the security of the authentication system.

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