CVE-2026-25550Public exploitNetwork attack vector

Unauthenticated file access via .NET Remoting unmarshalling

Published Jun 4, 2026 · Updated Jun 4, 2026

Object unmarshalling in Seagull Software BarTender 2010, 2016, and 2019 allows remote attackers to read or write server files. The TCP 7375 service accepts anonymous calls to version-specific singleton endpoints and lets caller-supplied paths drive .NET WebClient file operations or NTLMv2 authentication to a supplied UNC host. Network reachability is sufficient; file placement or captured credentials enables remote code execution or lateral movement, and BtSystem.Service.exe runs as NT AUTHORITY\SYSTEM.

CVSS severity9.3
Critical
EPSS probability0.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Object unmarshalling in Seagull Software BarTender 2010, 2016, and 2019 allows remote attackers to read or write server files. The TCP 7375 service accepts anonymous calls to version-specific singleton endpoints and lets caller-supplied paths drive .NET WebClient file operations or NTLMv2 authentication to a supplied UNC host. Network reachability is sufficient; file placement or captured credentials enables remote code execution or lateral movement, and BtSystem.Service.exe runs as NT AUTHORITY\SYSTEM.

The record

CVE
CVE-2026-25550
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Seagull Software, LLC
Product
BarTender
Classifications
CWE-306, CWE-502, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=10.1 R4
  2. Affected versionversion=0 <=R10
  3. Affected versionversion=0 <=R9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Seagull Software, LLC · BarTenderversion=0 <=10.1 R4; version=0 <=R10; version=0 <=R9

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-502Deserialization of Untrusted Data
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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