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CVE-2026-21258

Estado: AnalizadaMedia (5.5)—

Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (5)

Microsoft — 365 AppsMicrosoft — ExcelMicrosoft — OfficeMicrosoft — Office Long Term Servicing ChannelMicrosoft — Office Online Server

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-21258",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21258",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-02-11T15:25:23.136100Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "secure@microsoft.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Microsoft 365 Apps for Enterprise",
          "versions": [
            {
              "status": "affected",
              "version": "16.0.1",
              "lessThan": "https://aka.ms/OfficeSecurityReleases",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Excel 2016",
          "versions": [
            {
              "status": "affected",
              "version": "16.0.0.0",
              "lessThan": "16.0.5539.1002",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Office 2019",
          "versions": [
            {
              "status": "affected",
              "version": "19.0.0",
              "lessThan": "https://aka.ms/OfficeSecurityReleases",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Office LTSC 2021",
          "versions": [
            {
              "status": "affected",
              "version": "16.0.1",
              "lessThan": "https://aka.ms/OfficeSecurityReleases",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Office LTSC 2024",
          "versions": [
            {
              "status": "affected",
              "version": "16.0.0",
              "lessThan": "https://aka.ms/OfficeSecurityReleases",
              "versionType": "custom"
            }
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Office LTSC for Mac 2021",
          "versions": [
            {
              "status": "affected",
              "version": "16.0.1",
              "lessThan": "16.106.26020821",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Microsoft Office LTSC for Mac 2024",
          "versions": [
            {
              "status": "affected",
              "version": "16.0.0",
              "lessThan": "16.106.26020821",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Office Online Server",
          "versions": [
            {
              "status": "affected",
              "version": "16.0.0.0",
              "lessThan": "16.0.10417.20097",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2026-02-10T18:16:27.637",
  "references": [
    {
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21258",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secure@microsoft.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        },
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."
    },
    {
      "lang": "es",
      "value": "Validación de entrada incorrecta en Microsoft Office Excel permite a un atacante no autorizado divulgar información localmente."
    }
  ],
  "lastModified": "2026-06-17T10:18:22.760",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*",
              "vulnerable": true,
              "matchCriteriaId": "3259EBFE-AE2D-48B8-BE9A-E22BBDB31378"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*",
              "vulnerable": true,
              "matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*",
              "vulnerable": true,
              "matchCriteriaId": "CD88F667-6773-4DB7-B6C3-9C7B769C0808"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "B342EF98-B414-44D0-BAFB-FCA24294EECE"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*",
              "vulnerable": true,
              "matchCriteriaId": "CF5DDD09-902E-4881-98D0-CB896333B4AA"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*",
              "vulnerable": true,
              "matchCriteriaId": "26A3B226-5D7C-4556-9350-5222DC8EFC2C"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*",
              "vulnerable": true,
              "matchCriteriaId": "851BAC4E-9965-4F40-9A6C-B73D9004F4C1"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "23B2FA23-76F4-4D83-A718-B8D04D7EA37B"
            },
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              "vulnerable": true,
              "matchCriteriaId": "BF0E8112-5B6F-4E55-8E40-38ADCF6FC654"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "D31E509A-0B2E-4B41-88C4-0099E800AFE6"
            },
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              "matchCriteriaId": "017A7041-BEF1-4E4E-AC8A-EFC6AFEB01FE"
            },
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              "vulnerable": true,
              "matchCriteriaId": "EF3E56B5-E6A6-4061-9380-D421E52B9199"
            },
            {
              "criteria": "cpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0213E443-C4CD-41DC-9C07-B2D85B284389",
              "versionEndExcluding": "16.0.10417.20097"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secure@microsoft.com"
}