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CVE-2026-109082— Keycloak-services: keycloak-services: ciba confidential-only contract not enforced for public clients

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.

在 Keycloak 的 keycloak-services 组件中，发现了客户端发起的回廊认证（CIBA）实现存在一个安全漏洞。该组件负责处理一种高级认证流程，其中客户端可以代表用户发起登录请求。问题的根源在于，Keycloak 未能验证客户端是否被授权使用 CIBA 流程，从而导致公共客户端可以绕过安全要求。攻击者可以利用此漏洞，诱导用户批准一个登录请求，最终无需客户端密钥即可完全访问用户的账户。

CVSS 6.8 · Medium
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I. Basic Information for CVE-2026-109082

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: ciba confidential-only contract not enforced for public clients
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
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-2026-109082

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III. Intelligence Information for CVE-2026-109082

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Other References for CVE-2026-109082 (2)

Same Patch Batch · Red Hat · 2026-10-12 · 3 CVEs total

CVE-2026-107193 6.5 MEDIUM Foreman: api filter lookup ignores a search-limited filter permission
CVE-2026-107203 5.4 MEDIUM Foreman: domain and subnet interface api skips host search filters

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-287

V. Comments for CVE-2026-109082

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