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      <title>CVE-2026-11858 — Missing authorization in Quanos SCHEMA ST4 Client Update Service allows arbitrary file overwrite as SYSTEM</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-11858</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Quanos Solutions GmbH SCHEMA ST4&lt;/p&gt;
&lt;p&gt;Quanos SCHEMA ST4 on-premises contains a local privilege escalation vulnerability in the Client Update Service. The update service runs as NT AUTHORITY\SYSTEM and exposes a .NET Remoting interface over a named pipe without sufficient access controls or authorization. A local authenticated low-privileged user can connect to the interface and invoke privileged update methods such as Update(). This allows arbitrary file write and delete operations with SYSTEM privileges and can be used to achieve local privilege escalation.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Quanos Solutions GmbH SCHEMA ST4&lt;/p&gt;
&lt;p&gt;Quanos SCHEMA ST4 on-premises contains a local privilege escalation vulnerability in the Client Update Service. The update service runs as NT AUTHORITY\SYSTEM and exposes a .NET Remoting interface over a named pipe without sufficient access controls or authorization. A local authenticated low-privileged user can connect to the interface and invoke privileged update methods such as Update(). This allows arbitrary file write and delete operations with SYSTEM privileges and can be used to achieve local privilege escalation.&lt;/p&gt;</content:encoded>
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