PT-2026-50380 · Quanos Solutions Gmbh · Schema St4

Published 2026-06-17 · Updated 2026-06-17 · CVE-2026-11857

Mitre

CVSS v4.0

8.4

High

Base vector

AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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 AUTHORITYSYSTEM privileges. Network-only exploitation is not possible and local host access with an authenticated user session is required.

Fix

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

CVE-2026-11857

Affected Products

Schema St4

References · 1

• https://r.sec-consult.com/quanos · Note