CVE-2026-83657 Windows Modern Device Management (MDM) Tampering Vulnerability

{
  "id": "87aafc8447cde09bbcf9b4d442a9716f07ae285e5ca07b9d2afa448ee1b8a47b",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83657",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-83657 Windows Modern Device Management (MDM) Tampering Vulnerability",
    "summary": "Weak authentication in Windows MDM could allow an authorized attacker to perform local tampering.",
    "evidence": "Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.",
    "products": [
      {
        "name": {
          "value": "Windows Modern Device Management (MDM)",
          "evidence": "Windows Modern Device Management (MDM)"
        },
        "prerequisites": [
          {
            "value": "authorized attacker",
            "evidence": "an authorized attacker"
          }
        ],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-83657",
        "evidence": "CVE-2026-83657 Windows Modern Device Management (MDM) Tampering Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 24944,
  "published_at": "2026-10-13T14:00:00+00:00"
}