Webhook-url-http-3a-2f-2f169.254.169.254-2fmetadata-2fidentity-2foauth2-2ftoken: [exclusive]

Server-side request forgery (SSRF) The main vulnerability in any webhooks service is server-side request forgery (SSRF). An SSRF i... PlanetScale Server Side Request Forgery (SSRF) in webhook functionality

When code runs on a cloud virtual machine, it can "talk" to this IP to get information about itself without needing external credentials. It is a feature designed for convenience, allowing the VM to discover its own role, region, and—most importantly—its . Anatomy of the URL Server-side request forgery (SSRF) The main vulnerability in

The metadata service dutifully hands over a JSON Web Token (JWT) . This is a high-level digital badge that says, "I am the Admin Server." It is a feature designed for convenience, allowing

Webhooks are designed to send data to a URL provided by a user. The danger arises when an application takes that user-supplied URL and blindly makes a request to it. The danger arises when an application takes that

Run a sidecar proxy (e.g., Webhook Relay or Nginx ) that strictly filters outbound destinations. Never let your application logic resolve DNS or IPs directly.