Is probably right, but it could be old damage where the problem was fixed. It could be coming from the interior, like a leak above and not necessarily from outside the foundation.
It could just be from something that was previously covering that wall on the interior side of that wall.
It depends on the type of wall.
Odds on favorite is a water source, but even if it is, doesn't mean it is still (if it ever was) a problem. Like I said earlier, you have to take a look in person.
Karen.
Banks use the term discoloration because they don't want to say mold. It might be minor but it is usually some type of mold they are talking about
It probably means they believe there is some risk of mold either directly or due to water damage and they are just afraid to use the term "mold"
It really doesn't matter what it means. Any problem can be fixed. What ever the issue is it could be a negotiating point and may scare away other buyers.