From: IDGA
… So why is this so bad? First and foremost jailbreaking is a hack! Users are inviting a third party developer to hack your device. Plain and simple. Most recent versions of these tools are able to run over a simple webpage that is exploiting a few unpatched vulnerabilities in the smart phone operating system code. This risk was exposed last year when a worm “rick rolled” jailbroken iPhone users, exploiting a default password setting in secure shell daemon installed as part of the jailbreaking process.