High severity · published Aug 25, 2026
CVE-2026-66109
A missing authorization vulnerability exists in SKYSEA Client View and SKYMEC IT Manager
7.8
CVSS
0.2%
EPSS
No
On KEV
Description
A missing authorization vulnerability exists in SKYSEA Client View and SKYMEC IT Manager. If this vulnerability is exploited, an attacker who can log in to the Windows system on which the affected product is installed may execute arbitrary code with SYSTEM privilege.
CVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
SKYMEC IT Manager · Sky Co., LTD.
2023.225.03a; 2024.005.10a · source: vendor
SC
SKYSEA Client View · Sky Co., LTD.
through Ver.21.210.01f · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66109
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-66109
jvn.jp
https://jvn.jp/en/jp/JVN33423625/
www.skyseaclientview.net
https://www.skyseaclientview.net/news/260824_01/
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