Security researchers have already discovered an information disclosure vulnerability in IE7 hours after the release of Microsoft’s long-awaited browser software upgrade.

The flaw stems from error in the handling of redirections for URLs with the “mhtml:” URI handler. Security notification firm Secunia reports that the same bug was discovered six months ago in IE6 but remains unresolved. In any case, the flaw has managed to find its way into the code-base of IE7.

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