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A newly discovered security bug in Microsoft´s Internet Explorer 5.5 browser promises to send the company´s engineers back to work on a product released just this week.

The security hole lets an attacker read files on a target´s computer, according to Georgi Guninski, the Bulgarian bug hunter who demonstrated the bug.

The problem, as described in a Guninski advisory, lies in an ActiveX control that ships with IE 5.5, released this week, and with earlier versions of the browser. ActiveX is Microsoft´s method of letting a Web browser interact with other, more powerful desktop applications. The technology has been the target of security concerns for some time.

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