CVE-2026-66839

SYSTEM code execution via unquoted service path

Published Aug 5, 2026 · Updated Aug 5, 2026

Unquoted service path handling in Integrated Systems Technologies, Inc. NetKids iMark 5.2.5.0 and earlier allows local users to run code as SYSTEM. The installer registers the nkmsgService ImagePath as C:\Program Files\Netkids\iMarkV5\nkmsg\nkmsgService.exe without enclosing the path in quotation marks. A local user with write access to an earlier space-delimited path segment can have the Windows service launch a malicious executable with SYSTEM privileges.

CVSS severity8.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unquoted service path handling in Integrated Systems Technologies, Inc. NetKids iMark 5.2.5.0 and earlier allows local users to run code as SYSTEM. The installer registers the nkmsgService ImagePath as C:\Program Files\Netkids\iMarkV5\nkmsg\nkmsgService.exe without enclosing the path in quotation marks. A local user with write access to an earlier space-delimited path segment can have the Windows service launch a malicious executable with SYSTEM privileges.

The record

CVE
CVE-2026-66839
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
Integrated Systems Technologies, Inc.
Product
NetKids iMark
Classifications
CWE-428, T1574.009
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=V5.2.5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Integrated Systems Technologies, Inc. · NetKids iMarkversion=0 <=V5.2.5.0

Published CVSS scores

6.7JPCERT/CCCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.4JPCERT/CCCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-428Unquoted Search Path or Element
T1574.009Path Interception by Unquoted Path

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo