CVE-2026-83540

{
  "etk_id": "ETK-2026-838",
  "cve_id": "CVE-2026-83540",
  "display_id": "CVE-2026-83540",
  "ghsa_id": "GHSA-36jf-xmwg-5wp8",
  "euvd_id": "EUVD-2026-94163",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Authentication token reuse in Windows wolfSSHd",
  "summary": "Windows wolfSSHd versions 1.4.15 through 1.5.0 can retain authentication-token state across connections when password or public-key login is enabled. An attacker who already has a valid low-privilege account may cause a later login to receive a more privileged Windows identity. Non-Windows wolfSSHd deployments are not affected.",
  "mitigation": "Move the service to a non-Windows wolfSSHd deployment, or disable the affected Windows daemon where feasible. Until a vendor-fixed release is identified, restrict access to trusted authenticated users and limit accounts with higher Windows privileges.",
  "vendor": "wolfSSL",
  "product": "wolfSSH",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.4.15, <= 1.5.0"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "wolfSSH",
      "purl": null
    }
  ],
  "cwes": [
    287
  ],
  "cvss_score": 7.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0036,
  "epss_percentile": 0.288,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 7.754659516666667,
  "t0_at": "2026-10-07T02:40:35.137000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-07T02:40:35.137000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-07T02:40:35.137000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-83540"
    }
  }
}