CVE-2026-97766: Microsoft Office Excel Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Other sources
Microsoft Office 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 https://aka.ms/OfficeSecurityReleases - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.21056 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20228Patch KB5002928 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.14334.20974
Event History
Frequently Asked Questions
What must an attacker do to exploit this vulnerability?
The attacker must induce a user to interact with malicious Excel content. No attacker privileges are required, and the vulnerability is exploitable over a network with low attack complexity.
Which deployments should be reviewed for exposure?
Review systems running the listed Microsoft 365 Apps for Enterprise, Office LTSC 2021 or 2024 editions, Office for Mac editions, and Microsoft Office Online Server. The provided data does not identify unaffected versions or configurations.
What is the potential impact if exploitation succeeds?
A successful heap-based buffer overflow can allow unauthorized remote code execution. The supplied severity metrics indicate high impacts to confidentiality, integrity, and availability.