CVE-2026-42831

{
  "id": "CVE-2026-42831",
  "sourceIdentifier": "[email protected]",
  "published": "2026-05-12T18:17:25.673",
  "lastModified": "2026-10-26T00:10:00.150",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally."
    },
    {
      "lang": "es",
      "value": "Desbordamiento de búfer basado en montículo en Microsoft Office permite a un atacante no autorizado ejecutar código localmente."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Microsoft Office for Android",
          "versions": [
            {
              "version": "16.0.1",
              "lessThan": "16.0.19822.20190",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Office LTSC for Mac 2021",
          "versions": [
            {
              "version": "16.0.1",
              "lessThan": "16.109.26051019",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Office LTSC for Mac 2024",
          "versions": [
            {
              "version": "16.0.0",
              "lessThan": "16.109.26051019",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "REQUIRED",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-05-13T03:56:52.720107Z",
          "id": "CVE-2026-42831",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:*",
              "versionEndExcluding": "16.0.19822.20190",
              "matchCriteriaId": "71B289C6-6C8F-4217-AA2A-06931EE86372"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:macos:*:*",
              "matchCriteriaId": "873BD998-9D5A-4C09-A3B3-4DB12ABB6F72"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*",
              "matchCriteriaId": "BF0E8112-5B6F-4E55-8E40-38ADCF6FC654"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42831",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}