CVE-2026-86009

{
  "etk_id": "ETK-2026-1789",
  "cve_id": "CVE-2026-86009",
  "display_id": "CVE-2026-86009",
  "ghsa_id": "GHSA-crww-m82r-2wfm",
  "euvd_id": "EUVD-2026-102922",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Improper domain spoofing authorization in Mailu",
  "summary": "Mailu installations before f05aeb8322e2f61096af6b089d61ba6f40587d96 are affected by an authorization issue affecting hosted-domain spoofing settings. A domain manager may send mail as a different hosted domain in a way that receives that domain's SPF and DKIM authentication; access as a domain manager is required.",
  "mitigation": "Update Mailu to f05aeb8322e2f61096af6b089d61ba6f40587d96 or a later release containing that change. Until updated, restrict domain-manager access to trusted administrators and review spoofing permissions for hosted domains.",
  "vendor": "Mailu",
  "product": "Mailu",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<f05aeb8322e2f61096af6b089d61ba6f40587d96"
      ],
      "ecosystem": "mailu",
      "fixed_versions": [
        "master"
      ],
      "package_name": "Mailu",
      "purl": null
    }
  ],
  "cwes": [
    285
  ],
  "cvss_score": 8.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
  "epss_score": 0.003,
  "epss_percentile": 0.211,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 43.089092083333334,
  "t0_at": "2026-10-16T16:19:06.420000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-16T16:19:06.420000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-16T16:19:06.420000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-86009"
    }
  }
}