【Vulnerability Alert】Critical Security Vulnerability Found in Microsoft SharePoint Server (CVE-2026-45659)

• Subject: 【Vulnerability Alert】Critical Security Vulnerability Found in Microsoft SharePoint Server (CVE-2026-45659)

• Description:
  • Forwarded from Taiwan Computer Emergency Response Team / Coordination Center Security Alert TWCERTCC-200-202605-00000015
  • Microsoft SharePoint Server is an enterprise-grade collaboration platform that provides document management and team collaboration features, serving as the core platform for enterprise information integration. Recently, Microsoft released a critical security advisory (CVE-2026-45659, CVSS: 8.8). This vulnerability is an untrusted data deserialization vulnerability, which allows an authenticated attacker to execute code remotely via the network.
• Affected Platforms:
  • Microsoft SharePoint Enterprise Server 2016 versions prior to 16.0.5552.1002, Microsoft SharePoint Server 2019 versions prior to 16.0.10417.20128, Microsoft SharePoint Server Subscription Edition versions prior to 16.0.19725.20280
• Recommended Actions:
  • Apply patches according to the solutions released on the official website: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45659

Computer and Communication Center
Network Systems Division