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Microsoft Security Response CenterCVE-2026-78526

Microsoft Office Word Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

Read the vendor bulletin Get alerts for Microsoft Office 2019 for 32-bit editions
8.8CVSS out of 10High severity
Scope

What the vendor says is affected

  • Microsoft Office 2019 for 32-bit editions
  • Microsoft Office 2019 for 64-bit editions
  • Microsoft 365 Apps for Enterprise for 32-bit Systems
  • Microsoft 365 Apps for Enterprise for 64-bit Systems
  • Microsoft Office LTSC for Mac 2021
  • Microsoft Office LTSC 2021 for 64-bit editions
  • Microsoft Office LTSC 2021 for 32-bit editions
  • Microsoft Office LTSC 2024 for 32-bit editions
  • Microsoft Office LTSC 2024 for 64-bit editions
  • Microsoft Office LTSC for Mac 2024
  • Microsoft Office 2016 (32-bit edition)
  • Microsoft Office 2016 (64-bit edition)
  • Microsoft Office 365 for Mac

Versions the vendor lists as fixed

  • 16.0.10417.20207
  • 16.0.20326.20138
  • 16.112.26083020
  • 16.0.14334.20906
  • 16.0.17932.20976
  • 16.0.5569.1002
Next step

What the vendor recommends

Release Notes Install KB5002898.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-78526View CVSS, KEV, EPSS, and threat context
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