CVE-2026-55134: 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 LTSC 2021 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 Office LTSC 2021 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft SharePoint Server Subscription Edition<16.0.19725.20434
16.0.19725.20434
Microsoft Word 2016<16.0.5561.1000
16.0.5561.1000
Microsoft Word 2016<16.0.5561.1000
16.0.5561.1000
Microsoft Office LTSC for Mac 2024<16.111.26071215
16.111.26071215
Microsoft Office LTSC for Mac 2021<16.111.26071215
16.111.26071215
Microsoft 365 Apps for Enterprise<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 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 365 Apps for Enterprise<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Office 365 for Mac<16.111.26071215
16.111.26071215
Microsoft SharePoint Enterprise Server 2016<16.0.5561.1001
16.0.5561.1001
Microsoft SharePoint Server 2019<16.0.10417.20175
16.0.10417.20175
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
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
Frequently Asked Questions
1
What is the severity of CVE-2026-55134?
The severity of CVE-2026-55134 is high with a CVSS score of 7.8.
2
What impact does CVE-2026-55134 have on affected software?
CVE-2026-55134 allows an unauthorized attacker to execute code locally through a stack-based buffer overflow.
3
How do I fix CVE-2026-55134?
The issue can be resolved by applying the available patch from Microsoft.
4
Which products are affected by CVE-2026-55134?
CVE-2026-55134 affects Microsoft Word 2016, Microsoft 365 Apps for Enterprise, and several versions of Microsoft Office including 2019, 2021, and 2024.
5
Is CVE-2026-55134 a critical security issue?
Yes, CVE-2026-55134 is classified as a critical security issue due to its potential for remote code execution.