> Unfortunately, this is how I found out 10 years ago when someone hacked a 3rd party dependency I was using on my site.
Better than a customer telling you they got a nasty bug from your site!
Worst one I had was about 12 years ago when I got a phone call from the local golf club I'd set-up a site/CMS for, not kept patched as well as I should've, and a club member reported they were served porn ads instead of the Saturday draw... That was a lesson learnt