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Microsoft Security Response CenterCVE-2026-45457

Microsoft Word Remote Code Execution Vulnerability

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Read the vendor bulletin Get alerts for Microsoft Office 365 for Mac
7.8CVSS out of 10High severity
Scope

What the vendor says is affected

  • Microsoft Office 365 for Mac
  • 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 for Mac 2024

Versions the vendor lists as fixed

  • 16.110.26061317
  • https://aka.ms/OfficeSecurityReleases
Next step

What the vendor recommends

Release Notes Click to Run

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. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-45457View CVSS, KEV, EPSS, and threat context
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