We all know that Jailbreaking your iPhone is a very simple process and all it requires you to do is visit a web page.
However, after the recent release of the JailBreakMe iPhone hack, it has been suggested by the guys over at MacRumors that there is a major security issues on the iPhone OS 4 right now which could allow hackers to do whatever they want on your iPhone.
The security hole, JailBreakMe which is being used to jailbreak your iPhone has certain concerns relating to the PDF viewer and embedding fonts on the mobile Safarai, suggests MacRumors.
This essentially means that Apple needs to update their OS 4 to close the security issue. So it is now entirely up to you on whether you update or loose the jailbreak functionality.