SKYSEA Client View & SKYMEC IT Manager Multiple Vulnerabilities (CVE-2026-66109) RCE Advisory

Vulnerability Overview Multiple vulnerabilities exist in SKYSEA Client View and SKYMEC IT Manager (CVE-2026-66109, CVE-2026-68062, CVE-2026-68959, CVE-2026-68960, CVE-2026-69665). These vulnerabilities may lead to the following impacts: Possibility of arbitrary code execution under SYSTEM privileges Possibility of arbitrary code execution on Windows terminals with the product installed, following the reception of UDP packets Scope of Impact Affected Product Versions SKYSEA Client View - Ver.21.210.01f - Ver.19.300.09h～21.210.01f - Ver.19.300.09h～21.210.01f - Ver.21.210.01f - Ver.21.300.12g SKYMEC IT Manager - Ver.2023.03a, 2024.005.10a - Ver.2024.005.10a - Ver.2024.005.10a - Ver.2023.03a, 2024.005.10a - Ver.2025.205.08a Affected Target Components Master Server (including Global Master Server and Secondary Master Server) Management Terminal Client Terminal Standalone Terminal CVSS Scores CVSS 4.0 Base Scores - (1)8.5 / (2)5.8 / (3)5.8 / (4)5.8 / (5)8.5 CVSS 3.0 Base Scores - (1)7.8 / (2)8.5 / (3)8.5 / (4)8.5 / (5)7.8 Remediation SKYSEA Client View Users Update Module: Update modules are provided via the SKYSEA Client View Customer Support Website. Steps: Please update to Ver.21.310.01a or later. Website Link: SKYSEA Client View Customer Support Website FAQ Link: FAQ on Vulnerabilities SKYSEA Client View M1 Cloud Edition Users Automatic Update: Update modules will be automatically pushed starting from August 24, 2026. Website Link: SKYSEA Client View Customer Support Website FAQ Link: FAQ on Vulnerabilities SKYMEC IT Manager Users Update Module: Update modules are provided via the SKYMEC IT Manager Customer Support Website. Website Link: SKYMEC IT Manager Customer Support Website FAQ Link: FAQ on Vulnerabilities Additional Information Support News: Users are notified via support news. Product Website: Notifications are posted on the product website and the Customer Support Website. Patched Versions: Update installers for patched versions are released. Supported Versions: Countermeasures patches are released for supported versions. Disclaimer Company names and product names mentioned on the page are trademarks or brands of their respective companies. Partial or entire text or images on the page may be modified; any changes are prohibited regardless of the reason or form. The information provided reflects the status at the date of publication and may be subject to change thereafter; please note this in advance. Contact Information Head Office (Tokyo): 03-5860-2622 Head Office (Osaka): 06-6346-5722 Social Media SNS Portal: Instagram Other Links Our Products: SKYSEA Client View, SKYMEC IT Manager, SKYVIV Desktop Client, SKYMENU, SKYMENU Cloud, SKYMENU Mobile, SKYMENU Class, SKYMENU Pro Employment Information: General Recruitment, Events & Internships, Career Recruitment Information Site Providing Trends in the IT Industry and Product Information: Information Site "Sky IT TOPICS", SKYCE Column, SKYSEA Client View Column, SKYMENU Cloud Column, Career Recruitment Column What is Software Development?: Detailed introduction to processes and methodologies (Software Development) What is System Development?: Detailed introduction to development stages and case studies What is System Design?: Introduction to the design process flow and key points to avoid failures What is AI (Artificial Intelligence)?: Comprehensive explanation from definitions and history to application cases What is the GIGA School Concept?: Explanation of current status and issues What is ICT Education?: Simple explanation of meaning, benefits, and practical examples What is the Purpose of Business Card Management?: Introduction to implementation methods and cases of business card management software What is Ransomware?: Explanation of damage cases, countermeasures, and response methods Footer Information Handling of Personal Information About This Site Sky, Inc. Company Profile Security and Vulnerabilities Regarding Email --- End of Summary

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SKYSEA Client View & SKYMEC IT Manager Multiple Vulnerabilities (CVE-2026-66109) RCE Advisory