What should be done is a lawyer who is using mambo, should file a class action lawsuit on behalf of the users of mambo against Mr. Connoly. I am more than sure each of us can throw in a dollar towards it, which would more than cover the costs.
It would cost him millions to defend against it, even if it has no merit.
He would have to release the code to the court, which then becomes public knowledge, so that the users can remove the code from their website.