Microsoft has released a security advisory concerning a security vulnerability in its Excel spreadsheet application which can be exploited by attackers to run malicious code. According to the security advisory, the vulnerability is already being actively exploited.

The bug affects Microsoft Office Excel 2003 Service Pack 2, Excel Viewer 2003, Excel 2002, Excel 2000 and Microsoft Excel 2004 for Mac.

http://www.heise-security.co.uk/news/101859