Datamation writes "Exploit code for Windows Vista (though at this point only proof-of-concept code) has been published to a Russian hacker site, Eweek reports. Certain strings sent through the 'MessageBox' API apparently cause memory corruption. Though this is obviously cause for concern, at the moment it would seem access to the system would already be required to make use of the exploit. Determina has an analysis of the bug. Just last week, Trend Micro reported that Vista zero-days are being sold at underground hacker sites for $50,000."