The other day we mentioned an SMS Bug that your Windows Phone is vulnerable to. Basically someone sends you a certain text message and it reboots your Windows Phone and disables your Messaging Hub. Microsoft has confirmed that such exists and is diligently working on a solution.
Senior Product Manager for Windows Phone, Greg Sullivan states,
"We are aware of the issue and our engineering teams are examining it now. Once we have more details, we will take appropriate action to help ensure customers are protected."
Should you see your Windows Phone mysteriously re-boot and then loose the ability to launch the Messaging Hub, your only remedy is to perform a hard reset. We'll keep our fingers crossed that Microsoft finds and distributes a fix soon.
source: the verge