Org.keycloak/keycloak-services: webauthn attestation statement verification bypass

Summary

CVE	CVE-2025-12150
State	PUBLISHED
Assigner	redhat
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-02-27 09:16:15 UTC
Updated	2026-08-10 03:16:39 UTC
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.

Risk And Classification

Primary CVSS: v3.1 3.1 LOW from [email protected]

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

EPSS: 0.002020000 probability, percentile 0.102060000 (date 2026-08-09)

Problem Types: CWE-347 | CWE-347 Improper Verification of Cryptographic Signature

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	3.1	LOW	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N`
3.1	[email protected]	Secondary	3.1	LOW	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N`
3.1	CNA	CVSS	3.1	LOW	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

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

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Application	Redhat	Build Of Keycloak	All	All	All	All
Application	Redhat	Build Of Keycloak	-	All	All	All
Application	Redhat	Keycloak	24.0.2	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Keycloak	Keycloak	affected 26.4.4 semver	Not specified
CNA	Red Hat	Red Hat Build Of Keycloak 26.2	unaffected 26.2.11-1 * rpm	Not specified
CNA	Red Hat	Red Hat Build Of Keycloak 26.2	unaffected 26.2-12 * rpm	Not specified
CNA	Red Hat	Red Hat Build Of Keycloak 26.2	unaffected 26.2-12 * rpm	Not specified
CNA	Red Hat	Red Hat Build Of Keycloak 26.2.11	Not specified	Not specified
CNA	Red Hat	Red Hat Build Of Keycloak 26.4	unaffected 26.4.4-1 * rpm	Not specified
CNA	Red Hat	Red Hat Build Of Keycloak 26.4	unaffected 26.4-3 * rpm	Not specified
CNA	Red Hat	Red Hat Build Of Keycloak 26.4	unaffected 26.4-3 * rpm	Not specified
CNA	Red Hat	Red Hat Build Of Keycloak 26.4.4	Not specified	Not specified

References

Reference	Source	Link	Tags
github.com/keycloak/keycloak/issues/43723	[email protected]	github.com	Issue Tracking
access.redhat.com/errata/RHSA-2025:21371	[email protected]	access.redhat.com	Vendor Advisory
access.redhat.com/errata/RHSA-2025:21370	[email protected]	access.redhat.com	Vendor Advisory
access.redhat.com/errata/RHSA-2025:22089	[email protected]	access.redhat.com	Vendor Advisory
access.redhat.com/security/cve/CVE-2025-12150	[email protected]	access.redhat.com	Vendor Advisory
bugzilla.redhat.com/show_bug.cgi	[email protected]	bugzilla.redhat.com	Issue Tracking
access.redhat.com/errata/RHSA-2025:22088	[email protected]	access.redhat.com	Vendor Advisory
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

Vendor Comments And Credit

Discovery Credit

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

Additional Advisory Data

Source	Time	Event
CNA	2025-10-24T11:25:25.758Z	Reported to Red Hat.
CNA	2025-10-28T15:04:00.000Z	Made public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

There are currently no legacy QID mappings associated with this CVE.