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.
History

Thu, 15 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Tue, 13 Oct 2026 08:15:00 +0000

Type Values Removed Values Added
First Time appeared Redhat build Of Keycloak
Redhat single Sign-on
Vendors & Products Redhat build Of Keycloak
Redhat single Sign-on

Tue, 13 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-10-12T06:18:08.096Z

Updated: 2026-10-15T15:16:24.543Z

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

Link: CVE-2026-109082

cve-icon Vulnrichment

Updated: 2026-10-15T13:11:53.398Z

cve-icon NVD

Status : Awaiting Analysis

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

Modified: 2026-10-15T16:33:26.290

Link: CVE-2026-109082

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-09T18:42:43Z

Links: CVE-2026-109082 - Bugzilla