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Microsoft Security Response CenterCVE-2026-44818

Microsoft Excel Remote Code Execution Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

Read the vendor bulletin Get alerts for Microsoft Office 365 for Mac
7.0CVSS out of 10High severity
Scope

What the vendor says is affected

  • Microsoft Office 365 for Mac
  • Office Online Server
  • 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 Excel 2016 (32-bit edition)
  • Microsoft Excel 2016 (64-bit edition)

Versions the vendor lists as fixed

  • 16.110.26061317
  • 16.0.10417.20137
  • https://aka.ms/OfficeSecurityReleases
  • 16.0.5556.1001
Next step

What the vendor recommends

Release Notes Click to Run Install KB5002875. Install KB5002877.

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-2026-44818View CVSS, KEV, EPSS, and threat context
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