A real-life attack based on this kind of hole was discussed at https://www.reddit.com/r/personalfinance/comments/ay7aoy/ide... : someone says that an identity thief who knows all their knowledge-based question answers (because they have a copy of a credit report, no doubt) keeps somehow removing the freeze and committing more fraud.
Some KBA questions don't show up on your credit report, that being said, they can still be guessed with some certainty if you know the person. Some examples either me or my husband have gotten: -What month was [person] born? [person] was my mom and one option was "I don't know [person]." Luckily they didn't ask the date, because I don't know that, but I do know the month. -Which of the following people are/were you a…
I literally have no way to know which one of these they think is correct. At least 2 of them were correct at some point, depending on how up-to-date the data was, and the last three were indistinguishable, even when looking at my actual statements for my loan... So I failed out of my KBAs 4 straight times because they kept giving different variants of the same question, just with different sets of answers, until I could venn diagram out which one must be right because it was the only one that came up in all 4.