CVE-2026-110842

{
  "etk_id": "ETK-2026-1846",
  "cve_id": "CVE-2026-110842",
  "display_id": "CVE-2026-110842",
  "ghsa_id": "GHSA-fm6v-qhr5-4c32",
  "euvd_id": "EUVD-2026-101725",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Prototype pollution in n8n MCP workflow validation",
  "summary": "n8n versions before 2.41.4, and 2.42.x releases before 2.42.1, are affected by prototype pollution in the MCP workflow-validation tool. An authenticated member with workflow:read permission could alter authorization behavior and gain permissions they were not assigned, potentially taking over owner accounts that do not use MFA.",
  "mitigation": "Upgrade to n8n 2.41.4 or later, or to 2.42.1 or later when using the 2.42 release line. Require MFA for owner accounts and restrict workflow:read access to trusted users until all instances are updated.",
  "vendor": "n8n-io",
  "product": "n8n",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 2.41.4",
        ">= 2.42.0, < 2.42.1"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "2.41.4",
        "2.42.1"
      ],
      "package_name": "n8n",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 7.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
  "epss_score": 0.0031,
  "epss_percentile": 0.2271,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 32.761625816666665,
  "t0_at": "2026-10-14T22:52:17.341000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-14T22:52:17.341000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-14T22:52:17.341000+00:00",
      "url": "https://github.com/advisories/GHSA-fm6v-qhr5-4c32"
    }
  }
}