CVE-2026-81397: Microsoft Excel Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Other sources
Microsoft Excel Remote Code Execution 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 16.0.5569.1003Patch KB5002904 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.14334.20896 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20204Patch KB5002910 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5569.1003Patch KB5002914 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.20131.20246 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.20960
Event History
Frequently Asked Questions
What must an attacker do to exploit this issue?
The attacker needs a user to interact with malicious Excel content. The vulnerability is locally exploitable with no attacker privileges required, but user interaction is required.
Which environments should be prioritized for review?
Review systems running the listed Microsoft Excel and Office products: Office 2016, Excel 2016, Microsoft 365 Apps for Enterprise, Office 365 for Mac, Office LTSC for Mac 2024, Office LTSC 2021 32-bit, and Office 2019 in both 32-bit and 64-bit editions.
What is the potential impact if exploitation succeeds?
Successful exploitation can allow code execution with high impact to confidentiality, integrity, and availability.