Autofill can be very convenient, but here’s a reason to be cautious about it. People have already chimed in with fixes so obvious (e.g., restricting autofill only to visible fields) that it makes you wonder why browsers don’t already have such safeguards.
…browsers like Chrome and Safari are set to autofill information into text boxes with data like your phone number, address, credit card number, etc. Typically, browsers will determine the type of information the site is asking for, then keep the rest. But, Kuosmanen notes, hackers can obscure certain text boxes—meaning users wouldn’t they’ve been autofilled. And since the malicious websites can be designed to look like pretty much anything, the danger is real.