CVE-2026-55946 Microsoft Copilot Information Disclosure Vulnerability

{
  "id": "ea97455190a3a205a670a5e656156823a902278c81da27981d7335af97c7c36b",
  "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55946",
  "method": "llm",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-55946 Microsoft Copilot Information Disclosure Vulnerability",
    "summary": "Microsoft Copilot has a command injection vulnerability that could allow an unauthorized attacker to disclose information over a network.",
    "evidence": "Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.",
    "products": [
      {
        "name": {
          "value": "Microsoft Copilot",
          "evidence": "Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "fixed_cves": [],
    "related_cves": [
      {
        "value": "CVE-2026-55946",
        "evidence": "CVE-2026-55946 Microsoft Copilot Information Disclosure Vulnerability"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "official-microsoft-security-updates",
  "document_id": 26091,
  "published_at": "2026-09-17T14:00:00+00:00"
}