CVE-2026-77898 Microsoft Office Remote Code Execution Vulnerability

{
  "id": "013581c26777fd3e031a5441285457301489bfdc277c3f6056f58172a88d6b96",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77898",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-77898 Microsoft Office Remote Code Execution Vulnerability",
    "summary": "Microsoft announced security updates for Microsoft Office for Mac and advises customers using affected Mac software to install the update.",
    "evidence": "Microsoft is announcing the availability of the security updates for Microsoft Office for Mac.",
    "products": [
      {
        "name": {
          "value": "Microsoft Office for Mac",
          "evidence": "security updates for Microsoft Office for Mac"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-77898",
        "evidence": "CVE-2026-77898 Microsoft Office Remote Code Execution Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 26110,
  "published_at": "2026-09-17T14:00:00+00:00"
}