A Discord webhook is a simple HTTPS endpoint that can accept automated messages or data without a full interactive login session. It is designed for integrations: a service can POST text, files, or JSON payloads into a channel when an event occurs.
In cyber security, webhooks matter because attackers can abuse them as a low-friction exfiltration path. A stealer or loader may send stolen credentials, cookies, screenshots, or system data to a webhook instead of contacting a custom command-and-control server. That reduces infrastructure overhead and can blend into normal HTTPS traffic. Defenders should watch for unexpected POST requests to webhook URLs, especially from processes that should not handle browser data, and correlate them with local file access or credential theft behavior. Allowlisting legitimate automation and inspecting unusual outbound destinations can help spot misuse early.