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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.

PUBLISHED Reserved 2025-10-24 | Published 2026-02-27 | Updated 2026-02-27 | Assigner redhat




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

Problem types

Improper Verification of Cryptographic Signature

Product status

Default status
unaffected

Any version before 26.4.4
affected

Default status
affected

26.2.11-1 (rpm) before *
unaffected

Default status
affected

26.2-12 (rpm) before *
unaffected

Default status
affected

26.2-12 (rpm) before *
unaffected

Default status
unaffected

Default status
affected

26.4.4-1 (rpm) before *
unaffected

Default status
affected

26.4-3 (rpm) before *
unaffected

Default status
affected

26.4-3 (rpm) before *
unaffected

Default status
unaffected

Timeline

2025-10-24:Reported to Red Hat.
2025-10-28:Made public.

Credits

Red Hat would like to thank Stefan Kunz (cnlab) for reporting this issue.

References

access.redhat.com/errata/RHSA-2025:21370 (RHSA-2025:21370) vendor-advisory

access.redhat.com/errata/RHSA-2025:21371 (RHSA-2025:21371) vendor-advisory

access.redhat.com/errata/RHSA-2025:22088 (RHSA-2025:22088) vendor-advisory

access.redhat.com/errata/RHSA-2025:22089 (RHSA-2025:22089) vendor-advisory

access.redhat.com/security/cve/CVE-2025-12150 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2406192 (RHBZ#2406192) issue-tracking

github.com/keycloak/keycloak/issues/43723

cve.org (CVE-2025-12150)

nvd.nist.gov (CVE-2025-12150)

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