CVE-2026-97739: Microsoft Office Excel Remote Code Execution Vulnerability
Integer underflow (wrap or wraparound) 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 16.0.14334.20974 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20228Patch KB5002928
Event History
Frequently Asked Questions
Does exploitation require an authenticated account or user interaction?
The attacker does not need privileges or authentication, but exploitation requires user interaction. The attack vector is network-based and has low attack complexity.
Which Office deployments are listed as affected?
The affected products include Microsoft 365 Apps for Enterprise; Office LTSC 2021 and 2024 for 32-bit and 64-bit editions; Office LTSC for Mac 2021 and 2024; and Microsoft Office Online Server.
Are server-hosted Excel environments in scope?
Yes. Microsoft Office Online Server is included in the affected software list, so server-hosted Office deployments should be assessed alongside desktop and Mac installations.