---
id: CVE-2026-105305
title: >-
  Keycloak-services: keycloak-services: device authorization grant bypasses
  per-client minimum.acr.value enforcement
summary: >-
  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 …
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-287
vendor: Red Hat
product: keycloak-services
affected:
  - keycloak-services (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - keycloak-services
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T07:33:32.777Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-105305'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-105305'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2545801'
    label: RHBZ#2545801
tags:
  - cve.org
ingestedAt: '2026-10-06T07:49:23.045Z'
---

## Overview

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.

## Affected

- `keycloak-services (all versions)`
- `rhbk/keycloak-rhel9 (all versions)`
- `keycloak-services`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

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.