CVE-2026-103647

{
  "etk_id": "ETK-2026-966",
  "cve_id": "CVE-2026-103647",
  "display_id": "CVE-2026-103647",
  "ghsa_id": "GHSA-xr9h-mj6v-hm4m",
  "euvd_id": "EUVD-2026-94836",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Cross-site scripting in hMailServer webmail attachments",
  "summary": "hMailServer 6.3.2 through 6.3.5 webmail can render a decrypted encrypted-message attachment in the webmail security context. An attacker who can send such a message may run script with the recipient's webmail session if the recipient opens the attachment in a new tab; webmail exposure requires the REST API to be enabled.",
  "mitigation": "Upgrade hMailServer to 6.3.6. Until the upgrade is complete, disable the REST API to prevent webmail from being served.",
  "vendor": "Progressive Robot Ltd",
  "product": "hMailServer",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 6.3.2, < 6.3.6"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "6.3.6"
      ],
      "package_name": "hMailServer",
      "purl": null
    }
  ],
  "cwes": [
    79
  ],
  "cvss_score": 8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N",
  "epss_score": 0.0025,
  "epss_percentile": 0.1497,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 47.8155174,
  "t0_at": "2026-10-08T10:53:05.628000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-08T12:24:22.544141+00:00",
      "days": 0.06339023311342593,
      "is_lower_bound": false,
      "measured_at": "2026-10-08T10:53:05.628000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-08T10:53:05.628000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-08T10:53:05.628000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-103647"
    }
  }
}