Seagull Software BarTender Unauthenticated RCE via .NET Remoting Service (CVE-2026-25550) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-25550

Seagull Software BarTender Unauthenticated RCE via .NET Remoting Service

Answer in brief

CVE-2026-25550 records a Unknown severity vulnerability in Seagull Software BarTender Unauthenticated RCE via .NET Remoting Service. The current sources do not mark it as known exploited. The current feed maps Seagull Software, LLC./BarTender 2010 (generic), Seagull Software, LLC./BarTender 2016 (generic), Seagull Software, LLC./BarTender 2019 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 4, 2026Updated Sep 2, 2026Source checked Sep 2, 2026First seen by HOL Sep 2, 2026Material review Sep 2, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Seagull Software, LLC./BarTender 2010 (generic), Seagull Software, LLC./BarTender 2016 (generic), Seagull Software, LLC./BarTender 2019 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Seagull Software, LLC./BarTender 2010generic	0	Not reported
Seagull Software, LLC./BarTender 2016generic	0	Not reported
Seagull Software, LLC./BarTender 2019generic	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Seagull Software, LLC./BarTender 2010, Seagull Software, LLC./BarTender 2016, Seagull Software, LLC./BarTender 2019.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 2, 2026

Sources and claim methodology

Upstream source description

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 12.1. Users of affected releases should upgrade to BarTender 12.1 or later.

Quoted source text, attributed separately from HOL analysis.