A flaw was found in the Dynamic Client Registration flow of the Keycloak identity and access management server. The issue occurs because the registration process fails to filter security-sensitive client attributes when a new client is created. An attacker with a valid Initial Access Token can register a client that bypasses audience checks during token introspection. This allows the attacker to view sensitive identity information, roles, and session details from access tokens belonging to other applications in the same realm.

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Fixes

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History

Tue, 06 Oct 2026 21:30:00 +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

Mon, 05 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Mon, 05 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 05 Oct 2026 06:15:00 +0000

Type Values Removed Values Added
Description A flaw was found in the Dynamic Client Registration flow of the Keycloak identity and access management server. The issue occurs because the registration process fails to filter security-sensitive client attributes when a new client is created. An attacker with a valid Initial Access Token can register a client that bypasses audience checks during token introspection. This allows the attacker to view sensitive identity information, roles, and session details from access tokens belonging to other applications in the same realm.
Title Keycloak-services: keycloak-services: token introspection audience bypass via dynamic client registration
First Time appeared Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
Weaknesses CWE-862
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': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-05T14:55:01.356Z

Reserved: 2026-10-05T05:40:48.473Z

Link: CVE-2026-105306

cve-icon Vulnrichment

Updated: 2026-10-05T14:50:27.641Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-05T06:16:58.530

Modified: 2026-10-06T15:09:20.387

Link: CVE-2026-105306

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-02T08:32:38Z

Links: CVE-2026-105306 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-06T21:09:32Z

Weaknesses