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CVE-2026-120984— Keycloak-services: keycloak-services: manage-clients to arbitrary code execution through inline javascript policy import

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 服务器的客户端管理组件中发现了一个漏洞。当启用授权服务后创建或导入客户端时，系统未能正确清除在配置过程中使用的内部会话属性。这使得拥有客户端管理权限的已认证攻击者能够绕过安全控制，上传恶意的 JavaScript 策略；该策略会在发起授权请求时于服务器上执行。成功利用此漏洞后，攻击者可在服务器上执行任意代码，进而可能危及整个系统的安全。

CVSS 9.1 · Critical
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I. Basic Information for CVE-2026-120984

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: manage-clients to arbitrary code execution through inline javascript policy import
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the Keycloak server's client management component. When a client is created or imported with authorization services enabled, the system fails to properly clear an internal session attribute used during the setup process. This allows an authenticated attacker with client management permissions to bypass security controls and upload a malicious JavaScript policy, which is then executed on the server when an authorization request is made. Successful exploitation could allow the attacker to run arbitrary code on the server, potentially compromising the entire system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
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-2026-120984

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III. Intelligence Information for CVE-2026-120984

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Other References for CVE-2026-120984 (2)

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-94