Quanos Solutions SCHEMA ST4 Client Update Service deserialization

Summaryinfo

A vulnerability was found in Quanos Solutions SCHEMA ST4. It has been rated as problematic. This affects an unknown function of the component Client Update Service. Performing a manipulation results in deserialization. This vulnerability was named CVE-2026-11857. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Quanos Solutions SCHEMA ST4 (version unknown). This affects an unknown function of the component Client Update Service. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented by Johannes Kruchem. The advisory is shared at r.sec-consult.com. This vulnerability is uniquely identified as CVE-2026-11857 since 06/10/2026. The exploitability is told to be easy. An attack has to be approached locally. Neither technical details nor an exploit are publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-37681). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Quanos Solutions

Name

• SCHEMA ST4

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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