Microsoft patched one bug in Windows last week, but missed another that hackers continue to exploit, according to security researchers at McAfee.

On Tuesday, Microsoft confirmed that cyber criminals are targeting victims using tricked-out PowerPoint files that exploit a “zero-day” vulnerability, or a bug that has not been patched.

“Microsoft is aware of a vulnerability affecting all supported releases of Microsoft Windows, excluding Windows Server 2003,” the company said in a security advisory yesterday. “At this time, we are aware of limited, targeted attacks that attempt to exploit the vulnerability through Microsoft PowerPoint.”

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