HP made an announcement on 2/4/09 that “A potential security vulnerability has been identified with certain HP LaserJet printers, HP Color LaserJet printers and HP Digital Senders. The vulnerability could be exploited remotely to gain unauthorized access to files”

The list of printers that are affected by this is pretty large, 12 different printer families and all the models in those families.  HP says to download the latest firmware and update the printer.

Here is the link for the full article from HP.com