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Microsoft Security Response CenterCVE-2026-83949

Microsoft Office Word Information Disclosure Vulnerability

Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Read the vendor bulletin Get alerts for Microsoft Word 2016 (64-bit edition)
5.5CVSS out of 10High severity
Scope

What the vendor says is affected

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

Versions the vendor lists as fixed

  • 16.0.5569.1000
  • 16.0.10417.20207
  • 16.0.14334.20906
  • 16.0.17932.20976
  • 16.0.20326.20138
Next step

What the vendor recommends

Release Notes Install KB5002923.

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-2026-83949View CVSS, KEV, EPSS, and threat context
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