As Ruslan Yakushev points out in this new blog entry, the same security issue that's effecting ASP.NET pages running on IIS web servers can still open up PHP scripts running on the same server.

Microsoft has recently released a Security Advisory about a security vulnerability in ASP.NET. This vulnerability exists in all versions of ASP.NET. The PHP applications running on IIS are also subject to this vulnerability if ASP.NET is enabled in IIS.

The issue allows attackers to access the contents of various files on the server and could allow them to tamper with the data inside. Ruslan notes that, while Microsoft is coming up with a fix, one of the safest things you can do is either completely disable ASP.NET in the IIS server or use this workaround.