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Microsoft Word Remote Code Execution Vulnerability

Type: advisorySource: Official CVE List1 source record

Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Announced Source revision 1
Original source ↗

CVE-2026-55055

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-55055

Microsoft 365 Apps for Enterprise

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft Office 2019

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft Office 365 for Mac

Source reference: /containers/cna/affected/2/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft Office LTSC 2021

Source reference: /containers/cna/affected/3/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft Office LTSC 2024

Source reference: /containers/cna/affected/4/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft Office LTSC for Mac 2021

Source reference: /containers/cna/affected/5/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft Office LTSC for Mac 2024

Source reference: /containers/cna/affected/6/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft SharePoint Enterprise Server 2016

Source reference: /containers/cna/affected/7/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft SharePoint Server 2019

Source reference: /containers/cna/affected/8/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft SharePoint Server Subscription Edition

Source reference: /containers/cna/affected/9/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Microsoft Word 2016

Source reference: /containers/cna/affected/10/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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 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 365 for Mac",
    "versions": [
      {
        "status": "affected",
        "version": "1.0.0",
        "lessThan": "16.111.26071215",
        "versionType": "custom"
      }
    ]
  },
  {
    "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": "16.111.26071215",
        "versionType": "custom"
      }
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft Office LTSC for Mac 2024",
    "versions": [
      {
        "status": "affected",
        "version": "16.0.0",
        "lessThan": "16.111.26071215",
        "versionType": "custom"
      }
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft SharePoint Enterprise Server 2016",
    "versions": [
      {
        "status": "affected",
        "version": "16.0.0",
        "lessThan": "16.0.5561.1001",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft SharePoint Server 2019",
    "versions": [
      {
        "status": "affected",
        "version": "16.0.0",
        "lessThan": "16.0.10417.20175",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft SharePoint Server Subscription Edition",
    "versions": [
      {
        "status": "affected",
        "version": "16.0.0",
        "lessThan": "16.0.19725.20434",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "x64-based Systems"
    ]
  },
  {
    "vendor": "Microsoft",
    "product": "Microsoft Word 2016",
    "versions": [
      {
        "status": "affected",
        "version": "16.0.1",
        "lessThan": "16.0.5561.1000",
        "versionType": "custom"
      }
    ],
    "platforms": [
      "32-bit Systems",
      "x64-based Systems"
    ]
  }
]
Related CVEs
CVE-2026-55055

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#13568 · Revision 1
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Publisher date
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