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CVE-2026-16729
Summary
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Products covered
Microsoft 365 Apps for Enterprise for 64-bit Systems
Microsoft 365 Apps for Enterprise for 32-bit Systems
Microsoft Office LTSC for Mac 2021
Microsoft Office LTSC for Mac 2024
Microsoft Office 365 for Mac
Remediation
Release Notes
Vendor-listed fixes
https://aka.ms/OfficeSecurityReleases
16.114.26101123
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.
- Severity changed from High to Critical.
- Added fixed versions: 16.114.26101123.
Updates
- Published by Microsoft Security Response Center
The publication date reported by the vendor.
- Added to SecurityAlert
We collected the advisory from the official source.
- Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
- Confirmed at the source
Our collector saw this advisory during a later source check.