Low-Hanging Fruit (LHF) are vulnerabilities that are easy to find and exploit. We certainly don't want these types of issues in our websites, especially if they can be quickly mitigated with a small amount of effort. In network security, scanning does the trick for LHF identification. Unfortunately, in website security, though scanning is absolutely vital, it’s not that simple or sufficient. That’s because LHF may fall into either technical vulnerabilities, which website vulnerability scanners can find, or business logic flaws, which they can't find much of any.

At Jeremiah Grossman's blog.

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