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CVE-2026-25551 is an insecure deserialization vulnerability in Seagull Software BarTender 2021 R1 through 12.0.1. The flaw affects the DataServiceSingleton .NET Remoting endpoint exposed by BtSystem.Service.exe and bound to localhost on TCP port 7375. The endpoint is configured with BinaryServerFormatterSinkProvider and TypeFilterLevel set to Full, allowing unsafe BinaryFormatter deserialization. A low-privileged local user can send crafted BinaryFormatter payloads, including YSoSerial.NET-generated gadget chains, to the localhost-only remoting endpoint and trigger arbitrary code execution in the context of the service, resulting in elevation to NT AUTHORITY\SYSTEM.
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Cross-references every affected SKU, including bundled OEM variants.
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