CVE-2026-55948: Microsoft Excel Remote Code Execution Vulnerability
Published Jul 14, 2026
·Updated
Microsoft Excel Remote Code Execution Vulnerability
Other sources
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
— Microsoft
Affected Software
29 affected componentsFixes available
Microsoft Microsoft Excel
Microsoft Office LTSC 2024 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Office LTSC for Mac 2024<16.111.26071215
16.111.26071215
Microsoft Excel 2016<16.0.5561.1001
16.0.5561.1001
Microsoft Excel 2016<16.0.5561.1001
16.0.5561.1001
Microsoft 365 Apps for Enterprise<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
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 2021 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
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 365 for Mac<16.111.26071215
16.111.26071215
Microsoft Office 2019 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 Online Server<16.0.10417.20175
16.0.10417.20175
Microsoft 365 Apps
Microsoft 365 Apps
Microsoft Excel=2016
Microsoft Excel=2016
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
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·05:05 PM
Data Sourced
via MITRE·05:05 PM
DescriptionSeverity
Data Sourced
via NVD·05:17 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-55948?
CVE-2026-55948 has a high severity rating of 7.8.
2
How do I fix CVE-2026-55948?
The best way to fix CVE-2026-55948 is to apply the available patches from Microsoft.
3
What is CVE-2026-55948?
CVE-2026-55948 is a Microsoft Excel Remote Code Execution Vulnerability that allows unauthorized execution of code due to a use after free issue.
4
Which software is affected by CVE-2026-55948?
CVE-2026-55948 affects Microsoft Excel 2016, Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 2021, and Microsoft Office 2024.
5
What type of vulnerability is CVE-2026-55948?
CVE-2026-55948 is classified as a 'Use After Free' vulnerability.