Links:

• Twilio's disclosure of an Employee and Customer Account Compromise. 
• Update of AWS Security Reference Architecture is now available
• As the linked tweet says: "If you check out the AWS docs on IAM policy parsing order there is a flowchart that shows you can get an Allow outcome before the boundary policy is evaluated." 
• IAM-Deescalate: is an open source tool to help users reduce the risk of privilege escalation.