Microsoft Excel is the #1 tool at the top of that rather narrowly envisioned slippery slope, since you ask. Followed by any web browser.

As for data access; the vast majority of firms, worldwide, in every country, have abysmal internal controls, and in many cases, none at all. The filing cabinet is unlocked all day, everything from payroll to posters is in a share that every network login can R/W, and nobody cares.