Microsoft Corp. just issued a heads-up to its clients concerning the use of Apple Inc.’s Safari Web browser after several reports were presented about the occurrence of a rather dangerous system intrusion.

Apparently, a flaw found in Apple’s browser, known as the Safari bug, permits attackers to run unauthorized software on a victim’s computer and fill its desktop with potentially malicious executable files. The intrusion is also known as carpet bombing and the dangerous executables appear to users as normal Windows executables.

The flaw can lead to the complications presented earlier only combined with an unresolved bug in Internet Explorer. The IE bug has been reported to Microsoft more than a year ago and the connection with Apple’s flaw was discovered just last week.

Both the Safari and IE bugs "are moderate vulnerabilities that, combined, produce a critical flaw, which allows remote code execution," security researcher Aviv Raff told PCWorld.

Microsoft considers this to be a real threat to its users and issued a full security advisory three days ago, where it explained the vulnerability of the system and recommended all Windows users running the Safari browser to restrict its use until a safer version will be released by its developers or by Apple’s.

Apple already patched more than 17 vulnerabilities for the Windows Safari version and, surely, measures for identifying the mechanism’s full process and removing the bug will be taken as soon as possible.

According to Microsoft’s reports, the flaw affects all versions of Windows XP and Vista.