{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "\u003ca href=\"https://twitter.com/yanir_\"\u003eYanir Tsarimi\u003c/a\u003e"
        ]
      }
    ],
    "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-2026-41100 Microsoft 365 Copilot for Android Spoofing Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41100"
      },
      {
        "category": "self",
        "summary": "CVE-2026-41100 Microsoft 365 Copilot for Android Spoofing Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-41100.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": "Microsoft 365 Copilot for Android Spoofing Vulnerability",
    "tracking": {
      "current_release_date": "2026-06-09T07:00:00.000Z",
      "generator": {
        "date": "2026-06-09T19:32:20.300Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-41100",
      "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."
        },
        {
          "date": "2026-06-09T07:00:00.000Z",
          "legacy_version": "2",
          "number": "2",
          "summary": "Added Microsoft Excel for Android, Microsoft Word for Android, Microsoft Loop for Android, Microsoft PowerPoint for Android and Microsoft OneNote for Android softwares to the Security Updates table.  Customers that are running supported version of these products are encouraged to update to the indicated versions to be protected from this vulnerability."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.19822.20190",
            "product": {
              "name": "Microsoft 365 Copilot for Android \u003c16.0.19822.20190",
              "product_id": "2"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.19822.20190",
            "product": {
              "name": "Microsoft 365 Copilot for Android 16.0.19822.20190",
              "product_id": "21044"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft 365 Copilot for Android"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.19822.20190",
            "product": {
              "name": "Microsoft Excel for Android \u003c16.0.19822.20190",
              "product_id": "5"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.19822.20190",
            "product": {
              "name": "Microsoft Excel for Android 16.0.19822.20190",
              "product_id": "12031"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Excel for Android"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.19822.20190",
            "product": {
              "name": "Microsoft Word for Android \u003c16.0.19822.20190",
              "product_id": "6"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.19822.20190",
            "product": {
              "name": "Microsoft Word for Android 16.0.19822.20190",
              "product_id": "11772"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Word for Android"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.19822.20190",
            "product": {
              "name": "Microsoft PowerPoint for Android \u003c16.0.19822.20190",
              "product_id": "4"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.19822.20190",
            "product": {
              "name": "Microsoft PowerPoint for Android 16.0.19822.20190",
              "product_id": "12032"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft PowerPoint for Android"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.19822.20190",
            "product": {
              "name": "Microsoft Loop for Android \u003c16.0.19822.20190",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.19822.20190",
            "product": {
              "name": "Microsoft Loop for Android 16.0.19822.20190",
              "product_id": "21364"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Loop for Android"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.19822.20190",
            "product": {
              "name": "Microsoft OneNote for Android \u003c16.0.19822.20190",
              "product_id": "3"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.19822.20190",
            "product": {
              "name": "Microsoft OneNote for Android 16.0.19822.20190",
              "product_id": "12153"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft OneNote for Android"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-41100",
      "cwe": {
        "id": "CWE-284",
        "name": "Improper Access Control"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality), make changes to disclosed information (Integrity), but cannot limit access to the resource (Availability).",
          "title": "According to the CVSS metrics, successful exploitation of this vulnerability could lead to some loss of confidentiality (C:L), and integrity (I:L) but lead to no loss of availability (A:N). What is the impact of this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "11772",
          "12031",
          "12032",
          "12153",
          "21044",
          "21364"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-41100 Microsoft 365 Copilot for Android Spoofing Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41100"
        },
        {
          "category": "self",
          "summary": "CVE-2026-41100 Microsoft 365 Copilot for Android Spoofing Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-41100.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "16.0.19822.20190:Security Update:https://play.google.com/store/search?q=copilot+365\u0026c=apps",
          "product_ids": [
            "2"
          ],
          "url": "https://play.google.com/store/search?q=copilot+365\u0026c=apps"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.excel\u0026hl=en_US",
          "product_ids": [
            "5"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.office.excel\u0026hl=en_US"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.word\u0026hl=en_US",
          "product_ids": [
            "6"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.office.word\u0026hl=en_US"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.powerpoint\u0026hl=en_US",
          "product_ids": [
            "4"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.office.powerpoint\u0026hl=en_US"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.loop",
          "product_ids": [
            "1"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.loop"
        },
        {
          "category": "vendor_fix",
          "date": "2026-05-12T07:00:00.000Z",
          "details": "16.0.19822.20190:Security Update:https://play.google.com/store/apps/details?id=com.microsoft.office.onenote",
          "product_ids": [
            "3"
          ],
          "url": "https://play.google.com/store/apps/details?id=com.microsoft.office.onenote"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 3.9,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Spoofing"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely"
        }
      ],
      "title": "Microsoft 365 Copilot for Android Spoofing Vulnerability"
    }
  ]
}