How do you manage situations where a client shares your candidate’s information with another company?

I recently had a candidate who made it to the final two for a position with my client. In the end, they opted for someone else, but they informed my candidate that they would be sharing their information with other hiring agencies.

While this could lead to new opportunities for my candidate, it ends up putting me in a difficult position.

I’m considering revising my client contract to address this issue. How do you approach situations like this?