ETK-2026-4448Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-4448",
  "cve_id": null,
  "display_id": "ETK-2026-4448",
  "ghsa_id": "GHSA-6q4w-p2f4-q8q8",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Unauthenticated email conversation takeover in FreeScout",
  "summary": "FreeScout versions before 1.8.251 can associate an inbound email with an existing helpdesk conversation using an insufficiently validated message identifier. An attacker who knows an identifier from a customer's message can take over the conversation, view subsequent replies, and impersonate the customer to support staff. Exploitation requires the installation to fetch email from a mailbox.",
  "mitigation": "Upgrade FreeScout to version 1.8.251 or later. Until upgraded, restrict access to helpdesk mailboxes and treat externally supplied message-threading headers as untrusted.",
  "vendor": null,
  "product": "FreeScout",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<1.8.251"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "1.8.251"
      ],
      "package_name": "FreeScout",
      "purl": null
    }
  ],
  "cwes": [
    290
  ],
  "cvss_score": 9.1,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 46.196977,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-11-14T07:58:08.012834+00:00",
      "days": -0.041077219976851854,
      "is_lower_bound": true,
      "measured_at": "2026-11-14T08:57:17.210202+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-11-14T06:59:05+00:00",
      "days": -0.08208431296296297,
      "is_lower_bound": true,
      "measured_at": "2026-11-14T08:57:17.210202+00:00",
      "url": "https://github.com/freescout-help-desk/freescout/security/advisories/GHSA-6q4w-p2f4-q8q8"
    }
  }
}