Exploring third-party services with webhooks
Hello!
Today, I want to show how the Webhooks feature of Secutils.dev can be used to explore third-party services from the outside, what a security researcher would call basic active reconnaissance. Reconnaissance is just a fancy word for gathering information about a target system to understand exploitable vulnerabilities and attack vectors. In this post our intent is innocent: we want to learn how a particular service implements a feature we like. The technique, however, is the same one a researcher would use.