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