CVE-2026-25551

HighCVSS 7.8

Published: 04/06/2026(UTC)Updated: 02/09/2026(UTC)Translated: 02/09/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.13%

3th percentile - higher than 3% of all known CVEs

Summary

Seagull Software BarTender 2021 R1 through 12.0.1 contains an insecure deserialization vulnerability that allows low-privileged local users to escalate privileges. The DataServiceSingleton .NET Remoting endpoint is bound to localhost on TCP port 7375, limiting the attack surface to local access only. The endpoint is configured with BinaryServerFormatterSinkProvider and TypeFilterLevel set to Full. An attacker can send YSoSerial.NET-generated BinaryFormatter payloads to achieve code execution as NT AUTHORITY\SYSTEM. The vulnerability was corrected in BarTender 12.1.

Risk Assessment

A local attacker with low privileges can gain full control of the system, potentially leading to system compromise and violation of data confidentiality, integrity, and availability.

Recommendation

It is recommended to upgrade to BarTender 12.1 or later immediately to eliminate the vulnerability.

Other vulnerabilities in BarTender

CVE-2026-25550Critical
Seagull Software BarTender 2010, 2016, and 2019 contain an unauthenticated remote code execution vulnerability in the .NET Remoting service on TCP port 7375. An attacker can exploit .NET object unmarshalling to read/write arbitrary files or coerce NTLMv2 authentication, potentially leading to credential disclosure, remote code execution, or lateral movement. The service runs as NT AUTHORITY\SYSTEM.

Original NVD description (English source)

Seagull Software BarTender 2021 R1 through 12.0.1 contains an insecure deserialization vulnerability that allows low-privileged local users to escalate privileges. The DataServiceSingleton .NET Remoting endpoint is bound to localhost on TCP port 7375 via BtSystem.Service.exe, limiting the attack surface to local access only. The endpoint is configured with BinaryServerFormatterSinkProvider and TypeFilterLevel set to Full. A low-privileged local attacker can send YSoSerial.NET-generated BinaryFormatter payloads to the localhost-bound endpoint to achieve code execution as NT AUTHORITY\\\\SYSTEM. The vulnerability was corrected in BarTender 12.1, released on August 14, 2026. Users should upgrade to BarTender 12.1 or later.