{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Eli Arshin with Microsoft"
        ]
      },
      {
        "names": [
          "Michal Kamensky with Microsoft"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-40381 Azure Connected Machine Agent Elevation of Privilege Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40381"
      },
      {
        "category": "self",
        "summary": "CVE-2026-40381 Azure Connected Machine Agent Elevation of Privilege Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-40381.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Azure Connected Machine Agent Elevation of Privilege Vulnerability",
    "tracking": {
      "current_release_date": "2026-05-12T07:00:00.000Z",
      "generator": {
        "date": "2026-05-12T17:53:09.181Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-40381",
      "initial_release_date": "2026-05-12T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-05-12T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c1.63",
            "product": {
              "name": "Azure Connected Machine Agent \u003c1.63",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "1.63",
            "product": {
              "name": "Azure Connected Machine Agent 1.63",
              "product_id": "12264"
            }
          }
        ],
        "category": "product_name",
        "name": "Azure Connected Machine Agent"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-40381",
      "cwe": {
        "id": "CWE-284",
        "name": "Improper Access Control"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An attacker who already has access to the affected system could interfere with a local service port used by ArcProxy and respond with specially crafted authentication data. By doing this, the attacker can cause the service to access and return files that would normally only be available to a more privileged system account, potentially exposing sensitive information.",
          "title": "How could an attacker exploit this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "12264"
        ],
        "known_affected": [
          "1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-40381 Azure Connected Machine Agent Elevation of Privilege Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40381"
        },
        {
          "category": "self",
          "summary": "CVE-2026-40381 Azure Connected Machine Agent Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-40381.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "1.63:Security Update (Windows):https://learn.microsoft.com/en-us/azure/azure-arc/servers/agent-release-notes",
          "product_ids": [
            "1"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-arc/servers/agent-release-notes"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "1.63:Security Update (Linux):https://learn.microsoft.com/en-us/azure/azure-arc/servers/agent-release-notes",
          "product_ids": [
            "1"
          ],
          "url": "https://learn.microsoft.com/en-us/azure/azure-arc/servers/agent-release-notes"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 6.8,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Azure Connected Machine Agent Elevation of Privilege Vulnerability"
    }
  ]
}