Shopify: [h1-2102] Improper Access Control at https://shopify.plus/[id]/users/api in operation UpdateOrganizationUserRole

Summary: There is an access control issue that happens when a Shopify Plus admin tries to assign a role to a user in another organisation. While the response shows an error message, an email is sent to the shop admin with the first name, last name and email address of the user. Steps To Reproduce...