CVE-2026-81947: 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 16.0.17932.20960 - 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 16.0.5569.1003Patch 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 16.0.10417.20207 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20207Patch KB5002910 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.20326.20138
Event History
Frequently Asked Questions
What must an attacker do to exploit this vulnerability?
The attacker must cause Excel to process malicious content, and user interaction is required. The attack is local, so it is not described as directly exploitable over the network.
Which environments should be prioritized for review?
Review deployments of Excel 2016, Office 2016, Microsoft 365 Apps for Enterprise, Office 365 for Mac, and Office LTSC 2024 for 32-bit, 64-bit, and Mac editions. The affected-software list also includes Microsoft Excel and Microsoft Office without further version detail.
What is the potential impact of successful exploitation?
Successful exploitation can allow an unauthorized attacker to execute code locally. The provided severity vector indicates high impacts to confidentiality, integrity, and availability.