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api-websocket

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WebSocket exploitation — origin-bypass (CSWSH cross-site WebSocket hijacking), missing per-message auth, message-type confusion, msg-flood DoS, ws→wss downgrade, hidden RPC routes in the WS frame layer.

packages/decepticon/decepticon/skills/standard/exploit/api/websocket/SKILL.md

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Source commit df879550544d36b6b1e69062f05adae28537adf2

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Last checked
Nov 8, 2026

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6,567
Repository last updated
Nov 7, 2026
License
Apache-2.0

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# WebSocket Attack Surface

## Detect

Look for `Upgrade: websocket` in any handshake. Common paths: `/ws`, `/socket.io`, `/graphql-ws`, `/cable` (Rails ActionCable), `/hub` (SignalR).

```bash
# Quick handshake test
curl -sk -i \
  -H "Connection: Upgrade" \
  -H "Upgrade: websocket" \
  -H "Sec-WebSocket-Key: $(openssl rand -base64 16)" \
  -H "Sec-WebSocket-Version: 13" \
  -H "Origin: https://target" \