Microsoft posted a warning to users last week that vulnerabilities in its Excel and PowerPoint office software could allow attackers to execute malicious code on a user's machine.
The vulnerability exists in the macro security framework, which basically scans a document for the presence of macros and asks a user if they want to run them.
The security measure was put in place because macros can be engineered to perform malicious actions. But a deliberately malformed macro can be inserted into a document, so that it bypasses the macro check and executes automatically.
The code could be written to perform any number of malicious actions on a victim's machine.
Microsoft also warned that the attack could come as a document sent via email, hosted on a website, or on a file share.
The vulnerability affects Microsoft Excel 2000 and 2002, and PowerPoint 2000 and 2002 for Windows and Mac, as well as Excel and PowerPoint 98 for Mac.
A patch is already available for vulnerable machines, here.
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago