Excel 2013. Security Vulnerability. Bug invalidates any worksheet protection.

Hi

I'm a professional Excel developer... and I wasn't amused with the changes to worksheet protection introduced in Excel 2013.  The enormous delays, up to 100ms per call to the Unprotect method from .NET, crippled my application.
But while trying to find a workaround I stumbled on a significant bug, which solves my performance problems rather drastically...

I can unprotect any workheet in a workbook without knowing the password.. right from the Excel 2013 UI.

I'm sorely tempted to publish my "find", but I rather keep stumm and get it fixed by the Excel development team.
So if someone can contact me?


Regards, 
Jurgen Volkerink aka keepITcool