Description
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.
Published: 2026-10-12
Score: 6.8 Medium
EPSS: n/a
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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History

Mon, 12 Oct 2026 07:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat red Hat Single Sign On
CPEs cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat red Hat Single Sign On

Mon, 12 Oct 2026 07:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Keycloak-services: keycloak-services: ciba confidential-only contract not enforced for public clients
First Time appeared Redhat
Redhat build Keycloak
Weaknesses CWE-287
CPEs cpe:/a:redhat:build_keycloak:
Vendors & Products Redhat
Redhat build Keycloak
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N'}


Subscriptions

Redhat Build Keycloak Red Hat Single Sign On
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-12T07:12:27.872Z

Reserved: 2026-10-12T06:09:06.647Z

Link: CVE-2026-109082

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-12T07:16:36.303

Modified: 2026-10-12T07:16:36.303

Link: CVE-2026-109082

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses