{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.70.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@grackle-ai/server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.70.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-346"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-25T17:27:48Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nThe 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\u0027s session cookie (which is `SameSite=Lax`, allowing top-level navigations).\n\nThis enables **cross-origin WebSocket hijacking** \u2014 if a user visits a malicious site while a Grackle session is active, the attacker\u0027s page could open a WebSocket and subscribe to real-time events (session output, task updates, environment state).\n\n**Affected code:**\n- `packages/server/src/ws-bridge.ts:80-91` \u2014 connection handler accepts WebSocket upgrades without checking `req.headers.origin`\n\n### Patches\n\n**Fix:** Validate `req.headers.origin` against an allowlist before accepting connections:\n```typescript\nconst origin = req.headers.origin || \"\";\nif (origin \u0026\u0026 !origin.includes(\"localhost\") \u0026\u0026 !origin.includes(\"127.0.0.1\")) {\n  ws.close(4003, \"Invalid origin\");\n  return;\n}\n```\n\n### Workarounds\n\nEnsure the Grackle server is only accessible on `127.0.0.1` (the default). Do not use `--allow-network` in untrusted network environments.\n\n### Resources\n\n- CWE-346: Origin Validation Error\n- File: `packages/server/src/ws-bridge.ts`",
  "id": "GHSA-w3hv-x4fp-6h6j",
  "modified": "2026-03-25T17:28:05Z",
  "published": "2026-03-25T17:27:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/nick-pape/grackle/security/advisories/GHSA-w3hv-x4fp-6h6j"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nick-pape/grackle"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "@grackle-ai/server has Missing WebSocket Origin Header Validation"
}