CVE-2026-87705 Windows Hyper-V Security Feature Bypass Vulnerability

{
  "id": "ac0e273f2d2c8137247de0bb539668268f61277a14b3798482c17a3907303e1d",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87705",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-87705 Windows Hyper-V Security Feature Bypass Vulnerability",
    "summary": "An unauthorized attacker on an adjacent network can bypass a security feature in Windows Hyper-V due to improper verification of a communication channel’s source.",
    "evidence": "Improper verification of source of a communication channel in Windows Hyper-V allows an unauthorized attacker to bypass a security feature over an adjacent network.",
    "products": [
      {
        "name": {
          "value": "Windows Hyper-V",
          "evidence": "CVE-2026-87705 Windows Hyper-V Security Feature Bypass Vulnerability"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-87705",
        "evidence": "CVE-2026-87705 Windows Hyper-V Security Feature Bypass Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 25624,
  "published_at": "2026-10-13T14:00:00+00:00"
}