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NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
STABLE
CVE-2026-25551 Insecure Deserialization Local Privilege Escalation in Seagull BarTender 2021 R1-12.0.1 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-25551
Post summary
The snippet announces CVE-2026-25551 with a concise vulnerability description of insecure deserialization leading to local privilege escalation, but it does not provide any PoC, exploit, patch, or active exploitation information.
Two vulnerabilities CVE-2026-25550 and CVE-2026-25551 in Seagull BarTender 2010 to 2021 allow unauthenticated remote code execution and privilege escalation via a .NET Remoting service on TCP 7375, VulnCheck reported. https://threatcluster.io/cluster/seagull-software-bartender-vulnerabilities-enable-rce-and-pr-14d85940
Post summary
The text announces two CVEs (CVE‑2026‑25550/25551) affecting Seagull BarTender that enable unauthenticated RCE and privilege escalation through a .NET Remoting service on port 7375.