Sometimes people just stumble upon things. Like trying and it works.
I’m not a hacker but even I did stumble upon a thing once. Back in time I wanted to download some scientific document I needed. I ended up at the given university page but there was no download link until login. I didn’t have the login but I realized that in the address bar in the browser they used logical structure. Something like university.edu/downloads/whatever. So I kept trying to directly type things in the address bar and it worked without login!
Sometimes hackers do the same. Trying something that shouldn’t work and it works. You don’t always need to hack in a system like you imagine from movies. You can make money if you can cheat in MMORPGs. Like, if you figure how to double login into a game (which absolutely should not happen), then you can give your game gold to your own character, log out and have double gold. Repeat it a few times, you have millions of gold. And as game gold or other objects can often be sold on ebay for real money (or could be some years ago), if you figured something like that, you could make actual money out of it.
Or for example you go home and realize that the neighbors online printer shows up in your print line unprotected. So you try and print on his printer and it works. Now you figure that this model of printer comes with this open setting so basically you can print anywhere in the world.
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