According to a Tech Crunch report, Schadde has discovered a bug that sends your AIM messages to random recipients without your knowledge or consent. The problem only seems to occur with jailbroken devices.
Schadde was sending a message from his desktop to his iPhone when he received a message back from a complete stranger. The recipient also forwarded him a screenshot of the notification he received.
On his Twitter feed Schadde posts that, there seems to be a brand new hack that reactivates push with the effect that received msg are broadcasted to strangers
We are looking into this matter and will post more information once it becomes available. If you have experienced this or know of a fix please share it in the comments.