CVE-2026-66109

SYSTEM code execution via missing authorization

Published Aug 25, 2026 · Updated Aug 25, 2026

Missing authorization in SKYSEA Client View and SKYMEC IT Manager allows local users to execute arbitrary code as SYSTEM. Sky has not disclosed the affected function, request, or authorization check, so the precise operation that accepts untrusted input remains unavailable. Exploitation requires a user who can log in to an affected Windows host; successful use grants SYSTEM-level code execution on that host.

CVSS severity8.5
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in SKYSEA Client View and SKYMEC IT Manager allows local users to execute arbitrary code as SYSTEM. Sky has not disclosed the affected function, request, or authorization check, so the precise operation that accepts untrusted input remains unavailable. Exploitation requires a user who can log in to an affected Windows host; successful use grants SYSTEM-level code execution on that host.

The record

CVE
CVE-2026-66109
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Sky Co., Ltd.
Product
SKYMEC IT Manager
Classifications
CWE-862, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=2023.225.03a
  2. Affected versionversion=2024.005.10a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Sky Co., Ltd. · SKYMEC IT Managerversion=2023.225.03a; version=2024.005.10a
Sky Co., Ltd. · SKYSEA Client Viewversion=0 <=Ver.21.210.01f

Published CVSS scores

7.8IPACVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.5IPACVSS:4.0/AV:L/AC:L/AT:N/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1068Exploitation for Privilege Escalation

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

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Your stack

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