Microsoft announced the availability of a critical security patch yesterday affecting a variety of Windows operating systems.
Interestingly, the Windows 7 pre-beta build, which will be available to developers next Tuesday, also contains the bug. Microsoft stated "Customers running Windows 7 Pre-Beta are encouraged to download and apply the update to their systems. On Windows 7 Pre-Beta systems, the vulnerable code path is only accessible to authenticated users. This vulnerability is not liable to be triggered if the attacker is not authenticated, and therefore would be rated Important."
In a support article Microsoft details some Windows 7 Pre-Beta file information notes. The build string on the notes is 6.1.6801.4106, the same build string that has been screenshotted recently.
It is believed that the 6801 build is a milestone 3 (M3) build released to select customers and partners over the last few months.
Microsoft will be releasing the build to attendees at their professional developers conference next Tuesday.