NSA alerts Microsoft to "series of critical vulnerabilities" in Microsoft Exchange email app

The National Security Agency (NSA) said Tuesday that it had alerted Microsoft to "a series of critical vulnerabilities" in the Microsoft Exchange email application, prompting the company to issue a new patch.  

In a blog post, Microsoft said it had "not seen" the vulnerabilities used against its customers, but urged users to install timely updates.   "[G]iven recent adversary focus on Exchange, we recommend customers install the updates as soon as possible to ensure they remain protected from these and other threats," the company said, in a reference to an earlier disclosure, made in March, that suspected Chinese hackers had exploited different Exchange server flaws to spy on thousands of U.S. organizations.