CVE-2026-50678: Microsoft Excel Information Disclosure Vulnerability

Published Jul 14, 2026
·
Updated

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

Other sources

Microsoft Excel Information Disclosure Vulnerability

— Microsoft

Affected Software

28 affected componentsFixes available
Microsoft Excel 2016<16.0.5561.1001
16.0.5561.1001
Microsoft Office 365 for Mac<16.111.26071215
16.111.26071215
Microsoft Excel 2016<16.0.5561.1001
16.0.5561.1001
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 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 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 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 2019 for 32-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

Patch Available

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50678

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
DescriptionWeakness
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-2026-50678?

CVE-2026-50678 has a medium severity rating of 6.6.

2

How do I fix CVE-2026-50678?

To fix CVE-2026-50678, you should apply the latest patch available from Microsoft.

3

What products are affected by CVE-2026-50678?

CVE-2026-50678 affects Microsoft Excel 2016, Microsoft Office Online Server, Microsoft 365 Apps for Enterprise, and more.

4

What type of vulnerability is CVE-2026-50678?

CVE-2026-50678 is a heap-based buffer overflow vulnerability that allows information disclosure.

5

Can CVE-2026-50678 be exploited remotely?

CVE-2026-50678 requires local access, meaning exploitation cannot occur remotely.

Company

Resources

Contact

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