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So we ordered a piece of software from external software house becouse I was low on time and we needed it asap.

So. Long story short, their software was bugged as hell, they deny all the bugs and they have their BDD that they done and anything we say about it like "feature XYZ is broken on firefox" they will deny it "becouse it wasn't on BDD" or "let's get on call" (in which +- 6-7 people participate from their side and we of course have to pay them for this...)

So they fixed like 20% of bugs (mostly trivials/minors) Application is fairly small scope. You have integration with like 3 endpoints on arbitary API, user registration/login, few things to do in database (mainly math running from cron).

They done it in ASP so I don't know the language and enviroment so can't just fix it myself.

2 days ago (monday) they annoyed me to point where I just started to break things. For starters I found that every numeric input is vunrable to integer overflow (which is blocker). I figured most of fields are purefect opportunity to XSS (but I didn't bother to do JS... anything but not JS...). I figured I can embed into my name/surname/phone (none validated) anything in HTML...

So for now we have around 25 bugs, around 15 of them are blockers.

They figured it's somehow our fault that it's bugged and decided to do demo with us to show off how perfectly it works. I'm happy to break their demos. I figured I will register bunch users that have name - image with fixed/absolute position top:0;left:0 width/height 100% - this will effectively brick admin panel

Also I figured I can do some addotional sounds in background becouse why not. And I just dont know what to put in. It links to my server for now so I can freely change content of bricked admin panel.

I have curl's ready to execute in case they reset database.

I can put in GIFs or heck, even videos, dosen't really matter. Framework escapes some things for them so at least that. But audio/image/video works.

Now I have 2 questions:
- what image + audio combo will work the best (of course we need to keep it civil). Im thinking finding some meme with bugs or maybe nuclear logo image with some siren sound
- am I evil person?

Edit:

I havent stated this clearly:

"There is no BDD that describes that if user inserts malicious input server should deny it" - that's almost literally what we get from them....