New estimates regarding the recently-exploited Microsoft SharePoint vulnerabilities now evaluate that as many as 400 organizations may have been targeted.

The US government agency in charge of designing and maintaining nuclear weapons was among those breached by a hack of Microsoft's SharePoint server software, Bloomberg reported. However, attackers weren't able to obtain any sensitive or classified information,

Victims of the recent global hacking campaign include the National Institutes of Health and the National Nuclear Security Administration, officials said.