TL;DR: Login CSRF in combination with an HTTP Referer header-based open redirect in Airbnb’s OAuth login flow, could be abused to steal OAuth access tokens of all Airbnb identity providers and eventually authenticate as the victim on Airbnb’s website and mobile application. This attack did not rely on a specific OAuth identity provider app configuration flaw (e.g. wildcards in whitelisted redirect_uri URLs), which made it generic for all Airbnb’s identity providers (Facebook & Google at...
