CVE-2026-103259

{
  "etk_id": "ETK-2026-232",
  "cve_id": "CVE-2026-103259",
  "display_id": "CVE-2026-103259",
  "ghsa_id": "GHSA-qrhv-fqjc-jcmq",
  "euvd_id": "EUVD-2026-90653",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Session token exposure in n8n Dynamic Credentials",
  "summary": "n8n Dynamic Credentials authorization and revocation endpoints can expose collaborator session tokens in affected releases. An attacker who can register a resolver may obtain tokens during an account connection flow and use them to access credentials without authorization.",
  "mitigation": "Upgrade n8n to 2.39.6 or later, or to 2.40.1 or later on the 2.40 release line. Restrict resolver registration to trusted administrators until all affected instances are updated.",
  "vendor": "n8n-io",
  "product": "n8n",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 2.39.6",
        ">= 2.40.0, < 2.40.1"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "2.39.6",
        "2.40.1"
      ],
      "package_name": "n8n",
      "purl": null
    }
  ],
  "cwes": [
    863
  ],
  "cvss_score": 8.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:H/SI:L/SA:N",
  "epss_score": 0.0024,
  "epss_percentile": 0.1403,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 36.44413133333333,
  "t0_at": "2026-10-01T10:42:02.817000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-01T10:42:02.817000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-01T10:42:02.817000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-103259"
    }
  }
}