CVE-2026-107567

{
  "etk_id": "ETK-2026-2067",
  "cve_id": "CVE-2026-107567",
  "display_id": "CVE-2026-107567",
  "ghsa_id": "GHSA-8h9p-r7cp-qhr5",
  "euvd_id": "EUVD-2026-104406",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unauthorized DKIM signing in hMailServer",
  "summary": "hMailServer 6.0.0 through 6.3.6 can apply a hosted domain's DKIM signature to attacker-controlled mail, enabling forged mail to appear authenticated to external recipients. Exposure requires DKIM signing to be enabled for the affected hosted domain and a path that sends the message outside the server, such as forwarding, aliases, or mailing rules.",
  "mitigation": "Disable DKIM signing for affected hosted domains and restrict external forwarding, aliases, lists, and mail rules until a corrected release is available. Rotate or revoke exposed DKIM keys to reduce reuse of previously signed messages.",
  "vendor": "Progressive Robot Ltd",
  "product": "hMailServer",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 6.0.0, <= 6.3.6"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "hMailServer",
      "purl": null
    }
  ],
  "cwes": [
    348
  ],
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
  "epss_score": 0.0017,
  "epss_percentile": 0.0549,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 33.863245066666664,
  "t0_at": "2026-10-19T15:34:17.494000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-19T15:34:17.494000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-19T15:34:17.494000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-107567"
    }
  }
}