CVE-2026-11858: CWE-862 Missing Authorization in Quanos Solutions GmbH SCHEMA ST4
Quanos SCHEMA ST4 on-premises has a local privilege escalation vulnerability in its Client Update Service. The update service runs with SYSTEM privileges and exposes a .NET Remoting interface over a named pipe without proper authorization. This allows a local authenticated user with low privileges to invoke privileged update methods, enabling arbitrary file write and delete operations with SYSTEM rights. This vulnerability can lead to local privilege escalation.
AI Analysis
Technical Summary
CVE-2026-11858 describes a missing authorization vulnerability (CWE-862) in the Client Update Service of Quanos SCHEMA ST4 on-premises. The service runs as NT AUTHORITY\SYSTEM and exposes a .NET Remoting interface over a named pipe that lacks sufficient access controls. A local authenticated user with low privileges can connect to this interface and invoke privileged methods such as Update(), which allows arbitrary file write and delete operations with SYSTEM privileges, resulting in local privilege escalation.
Potential Impact
An authenticated local user with low privileges can escalate their privileges to SYSTEM by exploiting the exposed .NET Remoting interface in the Client Update Service. This enables arbitrary file write and delete operations with SYSTEM-level permissions, potentially compromising the entire system's integrity and security.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict local access to the affected system and limit authenticated user permissions to trusted personnel only. Monitor for vendor updates regarding patches or official mitigations.
CVE-2026-11858: CWE-862 Missing Authorization in Quanos Solutions GmbH SCHEMA ST4
Description
Quanos SCHEMA ST4 on-premises has a local privilege escalation vulnerability in its Client Update Service. The update service runs with SYSTEM privileges and exposes a .NET Remoting interface over a named pipe without proper authorization. This allows a local authenticated user with low privileges to invoke privileged update methods, enabling arbitrary file write and delete operations with SYSTEM rights. This vulnerability can lead to local privilege escalation.
CVSS v4.0
Score 8.4high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-11858 describes a missing authorization vulnerability (CWE-862) in the Client Update Service of Quanos SCHEMA ST4 on-premises. The service runs as NT AUTHORITY\SYSTEM and exposes a .NET Remoting interface over a named pipe that lacks sufficient access controls. A local authenticated user with low privileges can connect to this interface and invoke privileged methods such as Update(), which allows arbitrary file write and delete operations with SYSTEM privileges, resulting in local privilege escalation.
Potential Impact
An authenticated local user with low privileges can escalate their privileges to SYSTEM by exploiting the exposed .NET Remoting interface in the Client Update Service. This enables arbitrary file write and delete operations with SYSTEM-level permissions, potentially compromising the entire system's integrity and security.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict local access to the affected system and limit authenticated user permissions to trusted personnel only. Monitor for vendor updates regarding patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- SEC-VLab
- Date Reserved
- 2026-06-10T09:08:26.174Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a32971a0b89be68884c1f9c
Added to database: 06/17/2026, 12:46:18 UTC
Last enriched: 06/24/2026, 16:36:46 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 149
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