Microsoft is responding to what one security firm terms a "highly critical" flaw in Internet Explorer.

The software giant said it is planning to release a pre-patch advisory with instructions on avoiding the security problem.

Attackers could exploit a flaw in the "createTextRange()" method used by IE to control radio buttons, according to Copenhagen, Denmark-based Secunia Research, which first reported the flaw.

The security hole would enable malicious hackers to execute code when IE users visit a specially crafted Web site, according to an alert published by Secunia.

The flaw was confirmed on a fully patched version of IE 6.0 and Microsoft XP SP2, as well as IE 7 Beta 2 Preview released in January, according to the security company.

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