Microsoft has released a "critical" bell over a newly-discovered smirch in Windows.
In a safety advisory, the firm warned of a loophole that could be used by rouge hackers to rob in isolation data or hijack computers.
The bug potentially affects every user of the Internet Explorer web browser - around 900 million people worldwide.
Microsoft has released a program vegetable patch to urge against attacks, and mentioned it was working to rise a long-term fix.
The safety advisory, that was published on Friday, sum how the disadvantage may be used to control users and take over their machines.
Although the smirch is obviously inside Windows itself, it usually appears to start the way that Internet Explorer handles a few web pages and documents.
Microsoft certified that the complaint meant users could simply be fooled in to downloading rouge files by carrying out something as elementary as clicking on a web link.
"When the user clicked that link, the rouge book would run on the user's P.C. is to rest of the stream Internet Explorer session," wrote Microsoft deputy Angela Gunn in a website statement joined the advisory.
Once the P.C. had been hijacked, hackers could use it to rob personal data or send users to counterfeit websites, she added.
"Such a book might gather user information, e.g e-mail, travesty calm displayed in the browser or instead meddle with the user's experience."
Although Microsoft mentioned it had seen no indication that the glitch had already been exploited by hackers, it warned that investigate had shown it was a major threat.
And whilst it has not been able to eliminate the bug itself, it released a "fix it" safety vegetable patch to inhibit any attempts to use it.
All Windows users - quite those who use Internet Explorer - are being urged to download the put together whilst the company's safety group rise a way to plug the hole permanently.
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