The company has been called out repeatedly for inadequate security practices, and now we have another case in point: a successful SharePoint hack that’s among the worst in Microsoft’s history.

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

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.