CVE-2026-70318: Microsoft Excel Information Disclosure Vulnerability
Published Aug 11, 2026
·Updated
Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Other sources
Microsoft Excel Information Disclosure Vulnerability
— Microsoft
Affected Software
27 affected componentsFixes available
Microsoft Excel
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 for Mac 2021<16.112.26081010
16.112.26081010
Microsoft Office LTSC for Mac 2024<16.112.26081010
16.112.26081010
Microsoft Office LTSC 2024 for 32-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Office 365 for Mac<16.112.26081010
16.112.26081010
Microsoft Word 2016<16.0.5565.1000
16.0.5565.1000
Microsoft Office LTSC 2021 for 64-bit editions<https://aka.ms/OfficeSecurityReleases
https://aka.ms/OfficeSecurityReleases
Microsoft Word 2016<16.0.5565.1000
16.0.5565.1000
Microsoft 365 Apps for Enterprise<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 2019 for 32-bit editions<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 Word=2016
Microsoft Word=2016
Remediation
Event History
Aug 11, 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
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·05:19 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-70318?
CVE-2026-70318 has a medium severity rating of 5.5.
2
What does CVE-2026-70318 affect?
CVE-2026-70318 affects multiple versions of Microsoft Excel and Microsoft Office software.
3
What type of vulnerability is CVE-2026-70318?
CVE-2026-70318 is categorized as an information disclosure vulnerability due to improper input validation.
4
How do I fix CVE-2026-70318?
To mitigate CVE-2026-70318, ensure that you update your Microsoft Office applications to the latest version provided by Microsoft.
5
What is the potential impact of CVE-2026-70318?
An attacker exploiting CVE-2026-70318 may disclose sensitive information locally from Microsoft Excel.