{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "n8n"
              },
              {
                "fixed": "2.41.4"
              },
              {
                "introduced": "2.42.x"
              },
              {
                "fixed": "2.42.1"
              }
            ],
            "source": "DESCRIPTION"
          },
          "events": [
            {
              "introduced": "9fbd4c0738aaae893990b342d256843fe139fd5a"
            },
            {
              "fixed": "063ba759a74de9d32debd423225c4fca5615891f"
            },
            {
              "introduced": "86c23326c9501f4ccf5bb68705aa8bb234fc2ad2"
            },
            {
              "fixed": "e1d17800aef6e82cda5d8e58908e00ae47a1af4b"
            }
          ],
          "repo": "https://github.com/n8n-io/n8n",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-5jr4-xmvf-frmj"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-1321"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110842.json"
  },
  "details": "n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability in the MCP workflow-validation tool, whose interpreter evaluates caller-supplied code in the main process, reads inherited properties, and permits assignment onto shared prototypes. An authenticated member holding only a workflow:read grant can replace a built-in method with one returning a truthy value so server-side permission checks accept unheld scopes, enabling takeover of owner accounts not protected by MFA.",
  "id": "CVE-2026-110842",
  "modified": "2026-10-17T02:30:43.723763625Z",
  "published": "2026-10-14T22:52:17.341Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110842.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-5jr4-xmvf-frmj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110842"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/n8n-before-2.41.4-and-2.42.1-prototype-pollution-via-mcp-workflow-validation-interpreter"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "n8n before 2.41.4 and 2.42.1 Prototype Pollution via MCP Workflow-Validation Interpreter"
}