Bug 2460004 (CVE-2026-6856) - CVE-2026-6856 keycloak: keycloak: acceptable AAGUID policy bypass via packed self-attestation in WebAuthn registration
Summary: CVE-2026-6856 keycloak: keycloak: acceptable AAGUID policy bypass via packed ...
Keywords:
Status: NEW
Alias: CVE-2026-6856
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-21 08:08 UTC by OSIDB Bzimport
Modified: 2026-04-22 12:29 UTC (History)
28 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-04-21 08:08:29 UTC 
WebAuthn AAGUID policy bypass via packed self-attestation. Similar to CVE-2025-12150. When direct attestation is requested but the authenticator sends self-attestation (no x5c), the AAGUID is unverified, allowing bypass of the acceptable AAGUID allowlist.

Affects RHBK 26.4 and Keycloak 26.6. Patch in progress.
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