Microsoft is working on a patch that will prevent its Internet Explorer browser from inadvertently letting Web sites peer into any visitor´s cookie files.

Security enthusiasts Bennett Haselton and Jamie McCarthy demonstrated how a simple substitution in Web addresses (URLs) can foil IE´s security checks, exposing the cookie files that Web sites place on visitors´ computers. Cookies authenticate people´s identities when they return to Web sites and store data about visitors´ activities and purchases.

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