Can a priest act on a confession of molestation?

What, if any, ability does a priest or bishop have in order to stop a brother priest who has confessed to molestation of minors, according to Canon Law? Very often I hear, and am personally aware of local priests, being re-assigned; so presumably some action can be taken in response to a confession like this. What can a priest do without breaking the seal of the sacrament? What is the strongest action he can take to stop the molester?