Microsoft confirms that all versions of IE have critical new bug

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If you have not made the switch to Firefox or another IE alternative – many of you haven’t according to recent statistics, beware of a bug that could leave your PC vulnerable.

The unpatched bug in Internet Explorer 7 (IE7) that hackers are now exploiting also exists in older versions of the browser, including the still-widely-used IE6, Microsoft Corp. said late yesterday.

Today, a Danish security researcher added that Microsoft’s original countermeasure advice was insufficient and recommended that users take one of the new steps the company spelled out.

In a revised security advisory, Microsoft said research confirmed that the bug is within all its browsers, including those it currently supports — IE5.01, IE6 and IE7 — as well as IE8 Beta 2, a preview version that the company doesn’t support through normal channels.

Users running any of those browsers on Windows 2000, XP, Vista, Server 2003 or Server 2008 are at risk, Microsoft said.

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