Microsoft has warned of a flaw in all versions of Internet Explorer which could leave a significant number of internet users vulnerable to attack. FireEye, the security company which identified the flaw, said hackers are focusing on versions 9 through 11, which means around 26% of global browser use. Hackers are targeting browser users by luring them to click on malicious websites or downloads. Once in, hackers could remotely install viruses or even harvest private information.

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