Users who are using Apple’s Safari web browser on a Windows operating system are at high risk according to Microsoft’s security team. They said that there is a hole that allows malware to be posted on a user’s desktop without their permission.

The article at Networkworld.com quoted a story which says:
The recommendation comes a week after researcher Nitesh Dhanjani reported that Apple’s browser doesn’t seek user permission before downloading certain types of files. Even when encountering malicious iframes – a common occurrence these days even on the most trustworthy of sites – Safari obediently does what it’s told to do, including downloading a file hundreds of times.

Source: Network World