Description
A flaw was found in Keycloak. An authenticated user can bypass configured WebAuthn policies during credential registration by manipulating client-side JavaScript. This occurs because the server-side processAction() fails to validate that the newly created credential's parameters, such as public key algorithms, match the realm's configured WebAuthn policies. This could lead to the creation of credentials that do not adhere to administrative security requirements, potentially weakening the overall security posture of the system by allowing non-compliant authentication methods.
Published: 2026-05-19
Score: 4.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

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.

Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-g8vr-x4qh-25qg Keycloak: Policy bypass during WebAuthn credential registration via client-side JavaScript manipulation
History

Fri, 26 Jun 2026 07:45:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:build_keycloak:26.4::el9
References

Wed, 10 Jun 2026 21:45:00 +0000

Type Values Removed Values Added
References

Wed, 10 Jun 2026 18:15:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:build_keycloak: cpe:/a:redhat:build_keycloak:26.6::el9
References

Tue, 02 Jun 2026 19:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*

Tue, 19 May 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 19 May 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 19 May 2026 10:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat build Of Keycloak
Vendors & Products Redhat build Of Keycloak

Tue, 19 May 2026 06:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in Keycloak. An authenticated user can bypass configured WebAuthn policies during credential registration by manipulating client-side JavaScript. This occurs because the server-side processAction() fails to validate that the newly created credential's parameters, such as public key algorithms, match the realm's configured WebAuthn policies. This could lead to the creation of credentials that do not adhere to administrative security requirements, potentially weakening the overall security posture of the system by allowing non-compliant authentication methods.
Title Keycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credential registration via client-side javascript manipulation
First Time appeared Redhat
Redhat build Keycloak
Weaknesses CWE-603
CPEs cpe:/a:redhat:build_keycloak:
Vendors & Products Redhat
Redhat build Keycloak
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}


Subscriptions

Redhat Build Keycloak Build Of Keycloak
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-06-26T06:46:14.685Z

Reserved: 2026-05-18T13:26:21.427Z

Link: CVE-2026-8830

cve-icon Vulnrichment

Updated: 2026-05-19T16:32:04.310Z

cve-icon NVD

Status : Modified

Published: 2026-05-19T07:16:30.500

Modified: 2026-06-17T11:04:29.810

Link: CVE-2026-8830

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-19T05:00:04Z

Links: CVE-2026-8830 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-19T10:30:02Z

Weaknesses