CVE-2026-55128: Microsoft Word Remote Code Execution Vulnerability
Published Jul 14, 2026
·Updated
Microsoft Word Remote Code Execution Vulnerability
Other sources
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
— Microsoft
Affected Software
33 affected componentsFixes available
Microsoft Office LTSC 2024 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 Office LTSC 2024 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 for Mac 2021<16.111.26071215
16.111.26071215
Microsoft Word 2016<16.0.5561.1000
16.0.5561.1000
Microsoft Office 365 for Mac<16.111.26071215
16.111.26071215
Microsoft Office LTSC 2021 for 64-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 Word 2016<16.0.5561.1000
16.0.5561.1000
Microsoft Office LTSC 2021 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 2019 for 32-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
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 for Enterprise<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
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 Office Online Server<16.0.10417.20175
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·05:09 PM
Data Sourced
via MITRE·05:09 PM
DescriptionSeverity
Data Sourced
via NVD·06:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-55128?
The severity of CVE-2026-55128 is high, with a score of 7.8.
2
How do I fix CVE-2026-55128?
To fix CVE-2026-55128, it is recommended to apply the available patch from Microsoft.
3
What impact does CVE-2026-55128 have on systems?
CVE-2026-55128 allows an unauthorized attacker to execute code locally by exploiting a use-after-free vulnerability in Microsoft Word.
4
Which software is affected by CVE-2026-55128?
CVE-2026-55128 affects Microsoft Word 2016, Microsoft Office 2019, Microsoft Office 2021, Microsoft Office 2024, and Microsoft 365 Apps.
5
What type of vulnerability is CVE-2026-55128 classified as?
CVE-2026-55128 is classified as a Use After Free vulnerability.