The two patches are necessary because Vista is subject to the same security holes addressed in other Microsoft products during the huge patch delivered on 8 August.
Security patches are not normally issued for beta software, because no one is supposed to be using it in a critical environment. But Microsoft has issued patches for Vista before.
The patch, rated 'critical', covered a similar WMF flaw that hit the company's other operating systems a week earlier.
The vulnerability was in the Graphics Rendering Engine and could allow an attacker to gain control of a target machine.
Some commentators have suggested that Microsoft has issued the patches to pre-empt security software companies creating 'we've found a hole in Vista' stories.
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