CVE-2026-81401: Microsoft Excel Information Disclosure Vulnerability
Access of resource using incompatible type ('type confusion') in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Other sources
Microsoft Excel Information Disclosure Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.20960 - Upgrade
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Fixed in 16.0.5569.1003Patch KB5002904 - Upgrade
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Fixed in 16.0.14334.20896 - Upgrade
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Fixed in 16.0.5569.1003Patch KB5002914 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20207 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.20326.20138 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20207Patch KB5002910
Event History
Frequently Asked Questions
What access and user interaction are required for exploitation?
Exploitation is local and requires user interaction. The CVSS vector indicates no privileges are required, but an attacker would need to induce a user to interact with malicious content locally.
What is the potential impact if exploitation succeeds?
Successful exploitation can disclose information. The supplied severity vector indicates high confidentiality impact, with no integrity or availability impact.
Which Excel and Office product families are listed as affected?
The affected software list includes Excel 2016, Office 2016, Microsoft 365 Apps for Enterprise, Office 2019 for 64-bit editions, Office LTSC 2021 for 32-bit editions, Office LTSC 2024 for 64-bit editions, Office 365 for Mac, and Office LTSC for Mac 2024.