Eh, what?
"We are working to ensure that no other information was compromised"
"Ensure" is a very reassuring word. But how, exactly, can that be done? How are they going to unleak any other information that they find was leaked? Did they, by any chance, mean, "We are working hard to figure out whether any other information was compromised"? That is a necessary, and more achievable, but ultimately much less reassuring aspiration.