Academic Plagiarism: What are your thoughts?

Here’s the specific situation

I finished my bachelor's degree and moved straight into a graduate specialist program—only to find out later that parts of that undergrad thesis were plagiarized.

Is there any actual fallout for my current grad program? Since the bachelor's was a separate degree and already wrapped up, does it even matter?

I need to know every possible consequence and scenario here—and honestly, if anyone has advice on how to dodge this mess entirely, I'm all ears.

Thanks.

Plagiarism in what sense? Did you lift text from a published book, or did you just pass off someone else's thesis as your own work?

Secondly, your advisor is responsible for the content of your thesis. It was their job to stop you from plagiarizing.

Who is even making these accusations—the university, your advisor, or the person you actually copied from?