A flaw was found in the OIDC implementation of Keycloak, specifically within the Device Authorization Grant flow. This component allows devices with limited input capabilities to obtain security tokens. The issue occurs because the flow fails to check the minimum authentication level required by a client configuration. This allows an attacker who has stolen a user's password to bypass mandatory multi-factor authentication and gain unauthorized access to the Keycloak Admin REST API.

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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.

History

Tue, 06 Oct 2026 07:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in the OIDC implementation of Keycloak, specifically within the Device Authorization Grant flow. This component allows devices with limited input capabilities to obtain security tokens. The issue occurs because the flow fails to check the minimum authentication level required by a client configuration. This allows an attacker who has stolen a user's password to bypass mandatory multi-factor authentication and gain unauthorized access to the Keycloak Admin REST API.
Title Keycloak-services: keycloak-services: device authorization grant bypasses per-client minimum.acr.value enforcement
First Time appeared Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
Weaknesses CWE-287
CPEs cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-06T07:33:32.777Z

Reserved: 2026-10-05T05:38:12.281Z

Link: CVE-2026-105305

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-06T08:16:35.697

Modified: 2026-10-06T08:16:35.697

Link: CVE-2026-105305

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-06T08:30:18Z

Weaknesses