CVE-2026-55055: Microsoft Word Remote Code Execution Vulnerability

Published Jul 14, 2026
·
Updated

Microsoft Word Remote Code Execution Vulnerability

Other sources

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

— Microsoft

Affected Software

32 affected componentsFixes available
Microsoft Office 365 for Mac<16.111.26071215
16.111.26071215
Microsoft Office LTSC 2024 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Word 2016<16.0.5561.1000
16.0.5561.1000
Microsoft Office LTSC 2024 for 32-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft SharePoint Server Subscription Edition<16.0.19725.20434
16.0.19725.20434
Microsoft Office LTSC 2021 for 32-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2024<16.111.26071215
16.111.26071215
Microsoft Office LTSC 2021 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Word 2016<16.0.5561.1000
16.0.5561.1000
Microsoft 365 Apps for Enterprise<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft SharePoint Server 2019<16.0.10417.20175
16.0.10417.20175
Microsoft Office 2019 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Office 2019 for 32-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2021<16.111.26071215
16.111.26071215
Microsoft SharePoint Enterprise Server 2016<16.0.5561.1001
16.0.5561.1001
Microsoft 365 Apps
Microsoft 365 Apps
Microsoft Microsoft 365 Macos
Microsoft Office 2019
Microsoft Office 2019
Microsoft Office 2021
Microsoft Office 2021
Microsoft Office 2021 Macos
Microsoft Office 2024
Microsoft Office 2024
Microsoft Office 2024 Macos
Microsoft SharePoint Server<16.0.19725.20434
Microsoft SharePoint Server=2016
Microsoft SharePoint Server=2019
Microsoft Word=2016
Microsoft Word=2016

Remediation

Patch Available

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55055

Event History

Jul 14, 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·05:08 PM
Data Sourced
via MITRE·05:08 PM
DescriptionSeverity
Data Sourced
via NVD·06:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-55055?

CVE-2026-55055 has a severity rating of high at 7.8.

2

How do I fix CVE-2026-55055?

To fix CVE-2026-55055, users should apply the patch available from Microsoft.

3

What is the impact of CVE-2026-55055?

CVE-2026-55055 allows an unauthorized attacker to execute code locally due to a stack-based buffer overflow.

4

Which software is affected by CVE-2026-55055?

CVE-2026-55055 affects Microsoft Word 2016, Microsoft 365 Apps, Microsoft Office 2019, 2021, 2024, and SharePoint Server.

5

What type of vulnerability is CVE-2026-55055?

CVE-2026-55055 is a buffer overflow vulnerability related to remote code execution.

Company

Resources

Contact

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CVE-2026-55055 - Microsoft Word Remote Code Execution Vulnerability - SecAlerts