Threat actors exploit SharePoint flaws to access internal systems, steal sensitive data, and carry out surveillance, impersonation, and extortion.

Microsoft is investigating a potential leak within its MAPP program, suspecting that Chinese state-backed hackers exploited SharePoint vulnerabilities before patches were widely available. The security flaw,

A cyber-espionage campaign centered on vulnerable versions of Microsoft's server software now involves the deployment of ransomware, Microsoft said in a late Wednesday blog post.