Should we also consider Social Engineering as a big threat for corporate world?
This is a frequent topic in cybersecurity. And yes, warnings have been issued numerous, numerous times, that the weakest link in most networked devices and systems is the untrained human. I'm going to assume you aren't tuned into the cybersecurity communication channels, because this has been a priority topic for years, not that many people are doing a good job of mitigating the problem.
As a cybersecurity expert, I'm here to tell you that people are the #1 threat vector. Protect and train your people and you will reduce your worries 100 fold.