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CVE-2026-11857

HIGH
8.4
CVSS 4.0
Description
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.

Metadata

CVE ID
CVE-2026-11857
State
PUBLISHED
Assigner
SEC-VLab
Reserved
2026-06-10 09:08 UTC
Published
2026-06-17 11:42 UTC
Last updated
2026-06-17 14:56 UTC
Primary CWE
CWE-502
CWE-502 Deserialization of untrusted data
Vendor / Product
Quanos Solutions GmbH / SCHEMA ST4
Sources
cve.org  ·  NVD

Severity & Metrics

8.4 HIGH CVSS 4.0
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
Quanos Solutions GmbH SCHEMA ST4 — SCHEMA ST4 on-premises, all versions
Weakness (CWE)
CWESourceDescription
CWE-502 cna CWE-502 Deserialization of untrusted data
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.4 HIGH 4.0 cna CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References (1)
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