Apple Safari before 4.0.5 on Windows does not properly validate external URL schemes, which allows remote attackers to open local files and execute arbitrary code via a crafted HTML document. Per: http://lists.apple.com/archives/security-announce/2010/Mar/msg00000.html
CVE-ID: CVE-2010-0045 Available for: Windows 7, Vista, XP Impact: Visiting a maliciously crafted website may lead to arbitrary code execution Description: An issue in Safari's handling of external URL schemes may cause a local file to be opened in response to a URL encountered on a web page. Visiting a maliciously crafted website may lead to arbitrary code execution. This update addresses the issue through improved validation of external URLs. This issue does not affect Mac OS X systems. Credit to Billy Rios and Microsoft Vulnerability Research (MSVR) for reporting this issue.