CVE-2026-25550

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The service registers an unauthenticated singleton endpoint \u2014 BarTenderSystem for BarTender 2016 <= R9, and DataServiceSingleton for BarTender 2019 <= R10 \u2014 configured with BinaryServerFormatterSinkProvider and TypeFilterLevel set to Full. An unauthenticated remote attacker can exploit .NET Remoting object unmarshalling to read or write arbitrary files on the server using the .NET WebClient class, or coerce NTLMv2 authentication by supplying a UNC path to an attacker-controlled server, enabling sensitive credential disclosure, remote code execution, or lateral movement depending on service account privileges and network environment. The service runs in the context of NT AUTHORITY\\\\SYSTEM. This vulnerability is corrected in BarTender 12.0.1. 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Morales, Senior Pentester Team Leader, GM Sectec, Corp.", "type": "finder"}, {"lang": "en", "value": "Jan A. Rodriguez, Pentester, GM Sectec, Corp.", "type": "finder"}, {"lang": "en", "value": "VulnCheck", "type": "coordinator"}], "solutions": [{"lang": "en", "value": "Upgrade affected installations to BarTender 12.0.1 or later."}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "vulncheck"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-04T17:49:19.290960Z", "id": "CVE-2026-25550", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"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": "2026-06-04T17:50:01.515Z"}}]}}

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The service registers an unauthenticated singleton endpoint \u2014 BarTenderSystem for BarTender 2016 <= R9, and DataServiceSingleton for BarTender 2019 <= R10 \u2014 configured with BinaryServerFormatterSinkProvider and TypeFilterLevel set to Full. An unauthenticated remote attacker can exploit .NET Remoting object unmarshalling to read or write arbitrary files on the server using the .NET WebClient class, or coerce NTLMv2 authentication by supplying a UNC path to an attacker-controlled server, enabling sensitive credential disclosure, remote code execution, or lateral movement depending on service account privileges and network environment. The service runs in the context of NT AUTHORITY\\\\SYSTEM. This vulnerability is corrected in BarTender 12.0.1. Users of affected releases should upgrade to BarTender 12.0.1 or later."}, {"lang": "es", "value": "Seagull Software BarTender 2010, 2016 y 2019 contienen una vulnerabilidad de ejecuci\u00f3n remota de c\u00f3digo no autenticada en el servicio .NET Remoting expuesto en el puerto TCP 7375 a trav\u00e9s de BtSystem.Service.exe. El servicio registra un endpoint singleton no autenticado - BarTenderSystem para BarTender 2016 <= R9, y DataServiceSingleton para BarTender 2019 <= R10 - configurado con BinaryServerFormatterSinkProvider y TypeFilterLevel establecido en Full. Un atacante remoto no autenticado puede explotar la deserializaci\u00f3n de objetos .NET Remoting para leer o escribir archivos arbitrarios en el servidor utilizando la clase .NET WebClient, o forzar la autenticaci\u00f3n NTLMv2 proporcionando una ruta UNC a un servidor controlado por el atacante, lo que permite la divulgaci\u00f3n de credenciales sensibles, la ejecuci\u00f3n remota de c\u00f3digo o el movimiento lateral dependiendo de los privilegios de la cuenta de servicio y el entorno de red. El servicio se ejecuta en el contexto de NT AUTHORITY\\SYSTEM."}], "id": "CVE-2026-25550", "lastModified": "2026-09-16T16:17:07.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "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": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-25550", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-06-04T17:49:19.290960Z", "version": "2.0.3"}}]}, "published": "2026-06-04T18:16:28.747", "references": [{"source": "disclosure@vulncheck.com", "url": "https://gist.github.com/VAMorales/dde5b1c0415a8505ccd6fafdb095a618"}, {"source": "disclosure@vulncheck.com", "url": "https://portal.seagullscientific.com/downloads/bartender"}, {"source": "disclosure@vulncheck.com", "url": "https://trust.seagullsoftware.com/?tcuUid=55ed135f-683c-4e9b-a59d-7d4373c0ac7e"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/seagull-software-bartender-unauthenticated-rce-via-net-remoting-service"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-306"}, {"lang": "en", "value": "CWE-502"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{}

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