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Last updated: May 1, 2026
Why this module exists. Real-time chat, live trading dashboards, multiplayer games, collaborative editors — all run on WebSockets.
Why this module exists. Real-time chat, live trading dashboards, multiplayer games, collaborative editors — all run on WebSockets. And every web pentester I know has found at least one critical WebSocket bug because developers treat the protocol as “HTTP-but-faster” without realising the security model is fundamentally different.
How WebSockets differ from HTTP
- Single connection, bidirectional — once upgraded, the server can push to the client without a request.
- No same-origin policy at the protocol level — browsers enforce SOP for HTTP fetch, but WebSocket connections from JS aren’t blocked by SOP. The server has to enforce origin.
- No automatic CSRF tokens — every form library handles CSRF; WebSocket libraries usually don’t.
- Message-based, not request-based — once the connection is established, every message after that is “trusted” unless the server checks each.
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