CVE-2026-25550

Seagull Software BarTender Unauthenticated RCE via .NET Remoting Service

CVSS 4.0 9.3 CRITICALCVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-25550

Published

Seagull Software BarTender 2010, 2016, and 2019 contain an unauthenticated remote code execution vulnerability in the .NET Remoting service exposed on TCP port 7375 via BtSystem.Service.exe. The service registers an unauthenticated singleton endpoint — BarTenderSystem for BarTender 2016 <= R9, and DataServiceSingleton for BarTender 2019 <= R10 — 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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-25550

Published

BarTender 2010

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Seagull Software, LLC.",
                    "product": "BarTender 2010",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThanOrEqual": "10.1 R4",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "affected"
                }

BarTender 2016

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Seagull Software, LLC.",
                    "product": "BarTender 2016",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThanOrEqual": "R9",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "affected"
                }

BarTender 2019

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Seagull Software, LLC.",
                    "product": "BarTender 2019",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "lessThanOrEqual": "R10",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "affected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON