CVE-2026-11857
HighCVSS 8.4Summary
A local privilege escalation vulnerability in Quanos SCHEMA ST4 on-premises allows an authenticated attacker to execute arbitrary code with SYSTEM privileges via insecure deserialization in the .NET Remoting service.
Risk Assessment
The risk involves full system compromise by a local user, potentially leading to data theft, malware installation, or further attacks on the infrastructure.
Recommendation
Immediately update Quanos SCHEMA ST4 to a patched version. Until then, restrict system access to trusted users and monitor the client update service activity.
Original NVD description (English source)
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.