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Microsoft Security Response CenterCVE-2026-68798

Microsoft Excel Remote Code Execution Vulnerability

HighVendor CVSS 7.8 / 10 1 CVE Published Aug 11, 2026 at 7:00 AM UTC

Summary

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

Products covered

  • Microsoft Office 365 for Mac

Remediation

Release Notes

Vendor-listed fixes

  • 16.112.26081010

CVEs in this advisory 1

Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • Removed affected products: Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems, Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2021 for 64-bit editions, Microsoft Office....
    • Removed fixed versions: https://aka.ms/OfficeSecurityReleases.
    • The vendor changed its remediation guidance.
    • The vendor changed the advisory's last-updated date.
    • The vendor changed its remediation guidance.

Updates

  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. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.