"How can I report a loophole I’ve discovered in AWS?"

Hi,

The right (and only !) way is to open a Support ticket in the console of your AWS account.

Best,

Didier

If you believe that the documentation for a particular service needs improvement then you can also provide that using the link at the bottom of the page. This appears as "Provide Feedback" link you can click through to be taken to a feedback page where you can describe the problem.