GHSA-w3hv-x4fp-6h6j @grackle-ai/server has Missing WebSocket Origin Header Validation

• npm @grackle-ai/server: < 0.70.3 → fixed in 0.70.3

Impact The WebSocket upgrade handler in the server validates authentication (API key token or session cookie) but does not check the `Origin` header. A malicious webpage on a different origin could initiate a WebSocket connection to `ws://localhost:3000/ws` if it can leverage the user's session cookie (which is `SameSite=Lax`, allowing top-level navigations). This enables cross-origin WebSocket hijacking — if a user visits a malicious site while a Grackle session is active, the attacker's page could open a WebSocket and subscribe to real-time events (session output, task updates, environment state). Affected code: • `packages/server/src/ws-bridge.ts:80-91` — connection handler accepts WebSocket upgrades without checking `req.headers.origin` Patches Fix: Validate `req.headers.origin` against an allowlist before accepting connections: ```typescript const origin = req.headers.origin || ""; if (origin && !origin.includes("localhost") && !origin.includes("127.0.0.1")) { ws.close(4003, "Invalid origin"); return; } ``` Workarounds Ensure the Grackle server is only accessible on `127.0.0.1` (the default). Do not use `--allow-network` in untrusted network environments. Resources • CWE-346: Origin Validation Error • File: `packages/server/src/ws-bridge.ts`