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CVE-2026-105306— Keycloak-services: keycloak-services: token introspection audience bypass via dynamic client registration

Quick assessment

Affected
Red Hat Red Hat Build of Keycloak
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Keycloak 身份与访问管理服务器在动态客户端注册流程中存在一个漏洞。该问题是由于在创建新客户端时，注册过程未能过滤安全敏感的客户端属性所致。拥有有效初始访问令牌的攻击者可以注册一个客户端，该客户端在令牌内省（token introspection）期间可绕过受众（audience）检查。这使得攻击者能够查看同一域（realm）中其他应用访问令牌中的敏感身份信息、角色和会话详情。

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-105306

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: token introspection audience bypass via dynamic client registration
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-105306

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III. Intelligence Information for CVE-2026-105306

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Other References for CVE-2026-105306 (2)

Same Patch Batch · Red Hat · 2026-10-05 · 3 CVEs total

CVE-2026-105302 5.7 MEDIUM Keycloak-services: keycloak-services: user session note mapper exposes upstream idp access
CVE-2026-105301 4.0 MEDIUM Keycloak-services: keycloak-services: blind ssrf via x.509 authenticator fetching attacker

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-862

V. Comments for CVE-2026-105306

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