---
id: CVE-2026-109082
title: >-
  A flaw was found in the Client-Initiated Backchannel Authentication CIBA
  implementation within the keycloak-services component of Keycloak
summary: >-
  A flaw was found in the Client-Initiated Backchannel Authentication CIBA
  implementation within the keycloak-services component of Keycloak. This
  component handles advanced authentication flows where a client initiates a
  login on behalf o…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'
cwe:
  - CWE-287
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T08:17:19.787'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109082'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-109082'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2549478'
    label: secalert@redhat.com
tags:
  - nvd
ingestedAt: '2026-10-12T14:50:34.094Z'
---

## Overview

A flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-services component of Keycloak. This component handles advanced authentication flows where a client initiates a login on behalf of a user. The issue occurs because Keycloak fails to verify that a client is authorized to use the CIBA flow, allowing public clients to bypass security requirements. An attacker could use this flaw to trick a user into approving a login request, eventually gaining full access to the users account without needing a client secret.

## Remediation

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