It looks as if the world's most secure browser i.e. Firefox 3.0 may still have big security vulnerabilities in the core.

According to a report by TippingPoint, a research organization for vulnerability analysis and discovery, Firefox 3.0 has a security loophole which could allow an attacker to remotely execute arbitrary code.

The vulnerability does not come exclusively in Firefox 3.0 rather it has also been diagnosed in early versions of Firefox 2.0.x. This exploit was discovered within 5 hours of the official release of Firefox 3.0 on June 17th.

The good thing is that Mozilla Security Team has already taken this vulnerability into account and soon we can expect a security patch for Firefox. Just keep checking for updates daily and update Firefox as soon as a patch is available.