I have worked as a lead developer for a major print shop with about 100 employees. The entire order workflow for all branches was shoehorned into one order management system that was initially hacked together for one or two users. It was built on a then already ancient OpenERP system and it had a PHP and smarty frontend for the actual order management. All was hosted on one old debian box which was a VM on a Windows server.

At some point in time, MT decided to slap a web shop onto this system, which was part of the main code base. User data were saved into the same database with plain text passwords. That was convenient for the support people: if somebody forgot their password, you could call support and they would read you your password over the phone.

Another thing that made my hair raise in fear, was that for every single order, any working file was retained indefinitely, even in the light of the then-looming GDPR laws. This amounted of terabytes of data, much of it very private.

I worked at the main branch. When a person walked in, there was a desktop computer at the counter. No password protection, an order management screen open by default. People could just walk in and start viewing orders at will. I am not sure whether they did, but we did push MT to at least have manadatory password protection on their PCs.