Go read the full article: https://www.bleepingcomputer.com/news/security/45-000-facebook-users-leave-one-star-ratings-after-hackers-unjust-arrest/
"The young man discovered that he could access BKK’s website, press F12 to enter the browser’s developer tools mode, and modify the page’s source code to alter a ticket’s price.
Because there was no client or server-side validation put in place, the BKK system accepted the operation and issued a ticket at a smaller price.
As a demo, the young man says he bought a ticket initially priced at 9459 Hungarian forints ($35) for 50 Hungarian forints (20 US cents)."
Well, there you go. He admittedly hacked the system and stole a ticket. (kid probably wanted credit for showing the bug.

Kinda sounds like upper middle management got caught in a rather hard place, and forced a police response due to the fact that they are complete idiots when it comes to programming skills.
Not to mention management skills.
We all know how slippery these hackers are.
Hell, Hollywood has been telling us for years that we’re only a step away from armageddon due to these nefarious types.