The unusual procedure has been taken, says Microsoft, as it hopes that IT security vendors will work with their peer colleagues to counter the problem, which affects Windows XP and Server 2003 operating system users.
The security flaw allows crackers to remotely take control of users' machines, once they have been infected after visiting - but not clicking on - an infected website.
Newswire reports suggest that criminals have been working on exploits in the wild that can hack into users' PCS.
Microsoft reports it is working on a patch for the problem but, in the interim, users of Internet Explorer are being encouraged to visit the Microsoft support website here
Infosecurity notes that users of Mozilla Firefox can install two add-ons - IE Tab and Noscript - to help them counter the problem and still access web sites that require Internet Explorer access.
IE Tab allows Firefox to use the Internet Explorer screen rendering code engine, making IE-only sites think users are coming in using the Microsoft browser when they are using Firefox.
Noscript, meanwhile, allows Firefox users to selectively block and allow - temporarily if required - various scripts running on a web page. This is useful for accessing sites with potentially dubious advertising but required content.