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CVE-2026-25551 is an insecure deserialization vulnerability in Seagull Software BarTender 2021 R1 through 12.0.1. The localhost-only DataServiceSingleton .NET Remoting endpoint accepts BinaryFormatter deserialization through BinaryServerFormatterSinkProvider with TypeFilterLevel configured as Full. This unsafe configuration permits a local low-privileged user to submit a crafted BinaryFormatter object graph and trigger arbitrary code execution in the context of the privileged BarTender service.
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A local privilege-escalation vulnerability in Seagull Software BarTender 2021 R1 through 12.0.1. An insecure .NET Remoting BinaryFormatter deserialization configuration on the localhost-only DataServiceSingleton endpoint (TCP/7375) permits a low-privileged local user to execute code as NT AUTHORITY\SYSTEM.
A local privilege escalation vulnerability in Seagull Software BarTender caused by insecure deserialization in a localhost-bound .NET Remoting endpoint, allowing low-privileged users to execute code as NT AUTHORITY\\SYSTEM.
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