The message every founder hopes never gets sent

The message every founder hopes never gets sent:

"Hey, is my data safe with you? A friend changed the link in their browser and opened someone else's account."

The thing that gets me is the code behind this never fails. It runs, it passes tests, an AI reviewer waves it through. Swapping an ID in a URL isn't a crash, it's a door nobody remembered to lock, so nothing flags it.

And catching it yourself is a five-minute fix on a slow afternoon. Hearing about it from a customer is a different kind of day entirely.

AI ships features fast now. Deciding who's allowed to see what is still a human call, and an easy one to forget.

Curious how people here stay on top of it.