CVE-2026-54988: Microsoft Excel Information Disclosure Vulnerability

Published Jul 14, 2026
·
Updated

Microsoft Excel Information Disclosure Vulnerability

Other sources

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

— Microsoft

Affected Software

28 affected componentsFixes available
Microsoft Excel 2016<16.0.5561.1001
16.0.5561.1001
Microsoft Office LTSC for Mac 2024<16.111.26071215
16.111.26071215
Microsoft Office LTSC 2024 for 32-bit editions<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 for Mac 2021<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 365 Apps for Enterprise<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 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 Online Server<16.0.10417.20175
16.0.10417.20175
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 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

Patch Available

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54988

Event History

Jul 14, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
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
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Frequently Asked Questions

1

What is the severity of CVE-2026-54988?

CVE-2026-54988 has a medium severity rating of 6.1.

2

How do I fix CVE-2026-54988?

To resolve CVE-2026-54988, apply the available patch from Microsoft.

3

What is CVE-2026-54988?

CVE-2026-54988 is an Information Disclosure Vulnerability in Microsoft Excel that allows unauthorized attackers to disclose information.

4

Which software versions are affected by CVE-2026-54988?

CVE-2026-54988 affects Microsoft Excel 2016, Microsoft 365 Apps for Enterprise, Microsoft Office Online Server, and various versions of Microsoft Office.

5

What type of vulnerability is CVE-2026-54988?

CVE-2026-54988 is categorized as an out-of-bounds read vulnerability.

Company

Resources

Contact

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