Microsoft has published an advisory about a serious security vulnerability in its Office Web Components (OWC) software that could allow an attacker to run malicious code on your computer.
Microsoft says it has seen a limited number of attacks exploiting the vulnerability, which specifically lies in the Spreadsheet ActiveX control which can be embedded into webpages.
Affected products include (take a deep breath!) Microsoft Office XP Service Pack 3, Microsoft Office 2003 Service Pack 3, Microsoft Office XP Web Components Service Pack 3, Microsoft Office 2003 Web Components Service Pack 3, Microsoft Office 2003 Web Components for the 2007 Microsoft Office system Service Pack 1, Microsoft Internet Security and Acceleration Server 2004 Standard Edition Service Pack 3, Microsoft Internet Security and Acceleration Server 2004 Enterprise Edition Service…
Read more in my article on the Naked Security website.