CVE-2026-63525: Microsoft Office Word Remote Code Execution Vulnerability

Published Aug 11, 2026
·
Updated

Microsoft Office Word Remote Code Execution Vulnerability

Other sources

Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code locally.

— Microsoft

Affected Software

20 affected componentsFixes available
Microsoft Office 2019 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Word 2016<16.0.5565.1000
16.0.5565.1000
Microsoft Office 2019 for 32-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Word 2016<16.0.5565.1000
16.0.5565.1000
Microsoft Office LTSC 2021 for 32-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 32-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps
Microsoft 365 Apps
Microsoft Office 2019
Microsoft Office 2019
Microsoft Office 2021
Microsoft Office 2021
Microsoft Office 2024
Microsoft Office 2024
Microsoft Word=2016
Microsoft Word=2016

Remediation

Patch Available

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63525

Event History

Aug 11, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:06 PM
Data Sourced
via MITRE·05:06 PM
DescriptionSeverity
Data Sourced
via NVD·05:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-63525?

CVE-2026-63525 has a high severity rating of 7.8.

2

How do I fix CVE-2026-63525?

To fix CVE-2026-63525, apply the available security patch from Microsoft.

3

What software is affected by CVE-2026-63525?

CVE-2026-63525 affects Microsoft 365 Apps for Enterprise, Microsoft Word 2016, Microsoft Office 2019, Microsoft Office 2021, and Microsoft Office 2024.

4

What type of vulnerability is CVE-2026-63525?

CVE-2026-63525 is a remote code execution vulnerability caused by a numeric truncation error in Microsoft Office Word.

5

Can an attacker exploit CVE-2026-63525 remotely?

Yes, an unauthorized attacker can exploit CVE-2026-63525 to execute code locally.

Company

Resources

Contact

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