CVE-2026-11857— Insecure .NET Remoting deserialization in Quanos SCHEMA ST4 Client Update Service allows local privilege escalation
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Quanos Solutions GmbH | SCHEMA ST4 | SCHEMA ST4 on-premises, all versions | affected |
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I. Basic Information for CVE-2026-11857
Vulnerability Information
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Vulnerability Title
Insecure .NET Remoting deserialization in Quanos SCHEMA ST4 Client Update Service allows local privilege escalation
Source: CVE Program / CVE List V5
Vulnerability Description
Quanos SCHEMA ST4 on-premises contains a local privilege escalation vulnerability in the Client Update Service due to insecure deserialization in the .NET Remoting service. The service is configured with TypeFilterLevel.Full and is bound to local interfaces only through named pipes. A local authenticated attacker can connect to the local named pipe, obtain the .NET Remoting endpoint, and send specially crafted serialized objects. Successful exploitation results in arbitrary code execution in the context of the update process with NT AUTHORITY\SYSTEM privileges. Network-only exploitation is not possible and local host access with an authenticated user session is required.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Quanos Solutions GmbH SCHEMA ST4 反序列化漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Quanos Solutions GmbH SCHEMA ST4是Quanos Solutions GmbH公司的一款组件内容管理系统。 Quanos Solutions GmbH SCHEMA ST4 存在反序列化漏洞，该漏洞源于Client Update Service中的.NET Remoting服务存在不安全反序列化，可能导致权限提升。以下版本受到影响：SCHEMA ST4 on-premises所有版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Quanos Solutions GmbH | SCHEMA ST4 | SCHEMA ST4 on-premises, all versions | - |
II. Public POCs for CVE-2026-11857
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-11857 (1)
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V. Comments for CVE-2026-11857
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