VULNERABILITY DETAILS
This issue outlines the insecurity with ones credit card information in Chrome 

While in a credit card payment form in Chrome on any website, the autofill option will come up as "• • • • 1234".
Only when typing the correct numbers in any proper order, the autofill form will remain. Failure to type correct numbers that exist in the autofill will remove the autofill option, therefore, through process of elimination, one can find credit card numbers, in a short time.

By producing these steps, you can find all 4 sets of numbers.

Once all 4 sets of numbers are found, there is no need to guess the order of those numbers, Chrome will tell you which is the right order depending on whether or not the autofill form dissapears.


VERSION
Chrome Version: [64.0.3282.137] + [stable] + (Official Build) (64-bit)
Operating System: [Windows 10 Pro 64-bit, Build 16299]

REPRODUCTION CASE
Please refer to screenshots
Created dummy credit card for testing.

FOR CRASHES, PLEASE INCLUDE THE FOLLOWING ADDITIONAL INFORMATION
Type of crash: [tab, browser, etc.]
Crash State: [see link above: stack trace *with symbols*, registers,
exception record]
Client ID (if relevant): [see link above]