Advisoriesby IbisMicrosoftCVE-2026-63532
Microsoft Office: integer overflow
Fix: upgrade to 16.0.5565.1001 or later (2 fixed versions below)
Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to execute code locally.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Microsoft 365 Apps for Enterprise Product | >= 16.0.1, < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Office 2016 Product | >= 16.0.0, < 16.0.5565.1001 | 16.0.5565.1001 |
| Microsoft Office 2019 Product | >= 19.0.0, < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Office 365 for Mac Product | >= 1.0.0, < 16.112.26081010 | 16.112.26081010 |
| Microsoft Office LTSC 2021 Product | >= 16.0.1, < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC 2024 Product | >= 16.0.0, < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC for Mac 2021 Product | >= 16.0.1, < 16.112.26081010 | 16.112.26081010 |
| Microsoft Office LTSC for Mac 2024 Product | >= 16.0.0, < 16.112.26081010 | 16.112.26081010 |