CVE-2026-11857

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-11857", "assignerOrgId": "551230f0-3615-47bd-b7cc-93e92e730bbf", "state": "PUBLISHED", "assignerShortName": "SEC-VLab", "dateReserved": "2026-06-10T09:08:22.916Z", "datePublished": "2026-06-17T11:42:02.012Z", "dateUpdated": "2026-06-17T14:56:58.522Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "551230f0-3615-47bd-b7cc-93e92e730bbf", "shortName": "SEC-VLab", "dateUpdated": "2026-06-17T11:42:02.012Z"}, "title": "Insecure .NET Remoting deserialization in Quanos SCHEMA ST4 Client Update Service allows local privilege escalation", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-502", "description": "CWE-502 Deserialization of untrusted data", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-586", "descriptions": [{"lang": "en", "value": "CAPEC-586 Object Injection"}]}], "affected": [{"vendor": "Quanos Solutions GmbH", "product": "SCHEMA ST4", "versions": [{"status": "affected", "version": "SCHEMA ST4 on-premises, all versions", "versionType": "custom"}], "defaultStatus": "affected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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."}]}], "references": [{"url": "https://r.sec-consult.com/quanos"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.4, "vectorString": "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"}}], "workarounds": [{"lang": "en", "value": "Disable the Client Update Service until a fix is provided. Restrict local interactive access to systems running SCHEMA ST4 on-premises. Apply the principle of least privilege to local user accounts and prevent untrusted users from obtaining local sessions on affected hosts.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Disable the Client Update Service until a fix is provided. Restrict local interactive access to systems running SCHEMA ST4 on-premises. Apply the principle of least privilege to local user accounts and prevent untrusted users from obtaining local sessions on affected hosts."}]}], "solutions": [{"lang": "en", "value": "The vendor does not provide a patch. The vendor recommends disabling the affected Client Update Service. Updating the client is then only possible manually with a privileged user account.\n\n\n\nQuanos confirms that exploitation requires local host access with an authenticated user session. In properly managed environments following the Least Privilege principle, the attack surface is significantly reduced. Quanos Cloud/SaaS deployments are not affected. Quanos considers the migration to the Cloud/SaaS architecture the strategic long-term solution.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The vendor does not provide a patch. The vendor recommends disabling the affected Client Update Service. Updating the client is then only possible manually with a privileged user account.</p><p>Quanos confirms that exploitation requires local host access with an authenticated user session. In properly managed environments following the Least Privilege principle, the attack surface is significantly reduced. Quanos Cloud/SaaS deployments are not affected. Quanos considers the migration to the Cloud/SaaS architecture the strategic long-term solution.</p><p></p>"}]}], "credits": [{"lang": "en", "value": "Johannes Kruchem, SEC Consult Vulnerability Lab", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-17T14:56:39.718410Z", "id": "CVE-2026-11857", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-17T14:56:58.522Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-11857", "assignerOrgId": "551230f0-3615-47bd-b7cc-93e92e730bbf", "state": "PUBLISHED", "assignerShortName": "SEC-VLab", "dateReserved": "2026-06-10T09:08:22.916Z", "datePublished": "2026-06-17T11:42:02.012Z", "dateUpdated": "2026-06-17T14:56:58.522Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "551230f0-3615-47bd-b7cc-93e92e730bbf", "shortName": "SEC-VLab", "dateUpdated": "2026-06-17T11:42:02.012Z"}, "title": "Insecure .NET Remoting deserialization in Quanos SCHEMA ST4 Client Update Service allows local privilege escalation", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-502", "description": "CWE-502 Deserialization of untrusted data", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-586", "descriptions": [{"lang": "en", "value": "CAPEC-586 Object Injection"}]}], "affected": [{"vendor": "Quanos Solutions GmbH", "product": "SCHEMA ST4", "versions": [{"status": "affected", "version": "SCHEMA ST4 on-premises, all versions", "versionType": "custom"}], "defaultStatus": "affected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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."}]}], "references": [{"url": "https://r.sec-consult.com/quanos"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.4, "vectorString": "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"}}], "workarounds": [{"lang": "en", "value": "Disable the Client Update Service until a fix is provided. Restrict local interactive access to systems running SCHEMA ST4 on-premises. Apply the principle of least privilege to local user accounts and prevent untrusted users from obtaining local sessions on affected hosts.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Disable the Client Update Service until a fix is provided. Restrict local interactive access to systems running SCHEMA ST4 on-premises. Apply the principle of least privilege to local user accounts and prevent untrusted users from obtaining local sessions on affected hosts."}]}], "solutions": [{"lang": "en", "value": "The vendor does not provide a patch. The vendor recommends disabling the affected Client Update Service. Updating the client is then only possible manually with a privileged user account.\n\n\n\nQuanos confirms that exploitation requires local host access with an authenticated user session. In properly managed environments following the Least Privilege principle, the attack surface is significantly reduced. Quanos Cloud/SaaS deployments are not affected. Quanos considers the migration to the Cloud/SaaS architecture the strategic long-term solution.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The vendor does not provide a patch. The vendor recommends disabling the affected Client Update Service. Updating the client is then only possible manually with a privileged user account.</p><p>Quanos confirms that exploitation requires local host access with an authenticated user session. In properly managed environments following the Least Privilege principle, the attack surface is significantly reduced. Quanos Cloud/SaaS deployments are not affected. Quanos considers the migration to the Cloud/SaaS architecture the strategic long-term solution.</p><p></p>"}]}], "credits": [{"lang": "en", "value": "Johannes Kruchem, SEC Consult Vulnerability Lab", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-11857", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-06-17T14:56:39.718410Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-17T14:56:44.840Z"}}]}}

{"affected": [{"affectedData": [{"defaultStatus": "affected", "product": "SCHEMA ST4", "vendor": "Quanos Solutions GmbH", "versions": [{"status": "affected", "version": "SCHEMA ST4 on-premises, all versions", "versionType": "custom"}]}], "source": "551230f0-3615-47bd-b7cc-93e92e730bbf"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Quanos SCHEMA ST4 on-premises contiene una vulnerabilidad de escalada de privilegios local en el Servicio de Actualizaci\u00f3n del Cliente debido a deserializaci\u00f3n insegura en el servicio .NET Remoting. El servicio est\u00e1 configurado con TypeFilterLevel.Full y est\u00e1 enlazado a interfaces locales solo a trav\u00e9s de pipes con nombre. Un atacante autenticado local puede conectarse al pipe con nombre local, obtener el endpoint de .NET Remoting y enviar objetos serializados especialmente dise\u00f1ados. La explotaci\u00f3n exitosa resulta en ejecuci\u00f3n de c\u00f3digo arbitrario en el contexto del proceso de actualizaci\u00f3n con privilegios NT AUTHORITY\\SYSTEM. La explotaci\u00f3n solo por red no es posible y se requiere acceso al host local con una sesi\u00f3n de usuario autenticado."}], "id": "CVE-2026-11857", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-11857", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-17T14:56:39.718410Z", "version": "2.0.3"}}]}, "published": "2026-06-17T13:19:33.650", "references": [{"source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "url": "https://r.sec-consult.com/quanos"}], "sourceIdentifier": "551230f0-3615-47bd-b7cc-93e92e730bbf", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "SCHEMA ST4", "source": "cna", "vendor": "Quanos Solutions GmbH"}, "product": "schema_st4", "vendor": "quanos_solutions"}], "created": "2026-06-18T12:00:16.849890+00:00", "updated": "2026-06-20T23:03:29.553968+00:00", "vendors": ["quanos_solutions", "quanos_solutions$PRODUCT$schema_st4"]}