
Critical Zero-Day Vulnerabilities in Microsoft SharePoint Actively Exploited
Two new critical zero-day vulnerabilities in Microsoft SharePoint—CVE-2025-53770 and CVE-2025-53771—have been actively exploited since late last week, with at least 85 servers compromised worldwide. Background: From ToolShell to Active Exploitation In May 2025, researchers at Viettel Cyber Security chained two SharePoint flaws—CVE-2025-49706 and CVE-2025-49704—to create a