CVE-2026-66816 Microsoft SQL Server Security Feature Bypass Vulnerability

{
  "id": "e17b9cb9922e99e7441343177cec9540c609b908c52f6e11b252d32af7d81ea1",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66816",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-66816 Microsoft SQL Server Security Feature Bypass Vulnerability",
    "summary": "Insufficient logging in SQL Server may allow an authorized attacker to bypass a security feature over a network.",
    "evidence": "Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.",
    "products": [
      {
        "name": {
          "value": "Microsoft SQL Server",
          "evidence": "CVE-2026-66816 Microsoft SQL Server Security Feature Bypass Vulnerability"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-66816",
        "evidence": "CVE-2026-66816 Microsoft SQL Server Security Feature Bypass Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 26765,
  "published_at": "2026-09-08T14:00:00+00:00"
}