A new patch released Friday by Microsoft fixes a number of critical vulnerabilities in the browser and related products. One of the holes filled by the patch concerns a deficiency in a previous patch for which exploits have begun to appear. The vulnerabilities affect all versions of Internet Explorer since version 5.01, which is to say all versions that are supported and for which Microsoft is supplying such patches. A separate vulnerability also patched yesterday could allow an attacker to use Windows Media Player to construct an Internet Explorer attack.

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