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Hacking Slack using postMessage and WebSocket-reconnect to steal your precious token TLDR; I was able to create a malicious page that would reconnect your Slack WebSocket to my own WebSocket to steal your private Slack token. Slack fixed the bug in 5 hours (on a Friday) and paid me $3,000 for it. Recently a bug I found in Slack was published on HackerOne and I wanted to explain it, and the method
The WebSocket Echo Server at echo.websocket.org is a free, publicly available testing endpoint that has become an essential tool for developers working with real-time web technologies. This server provides instant echo responses for WebSocket connections, Server-Sent Events (SSE), and standard HTTP requests, making it invaluable for testing, debugging, and validating real-time implementations. Unl
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