How to patch basement window foam : HomeImprovement

My in-laws just noticed that part of their foundation is flaking off, revealing what was actually foam used presumably to fill a basement window. Pics of the outside and inside:

They don’t care about aesthetics but just want to patch it so that it’s secure from animals and moisture. Is there something easy I can apply to it that’s durable? Fiberglass? Flexseal?

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