CVE-2026-97778: Microsoft Office Excel Remote Code Execution Vulnerability
Integer overflow 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 16.0.10417.20228Patch KB5002928 - 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 https://aka.ms/OfficeSecurityReleases
Event History
Frequently Asked Questions
Does exploitation require authentication or user interaction?
An attacker does not need privileges or authentication, but exploitation requires user interaction. The attack vector is network-based and has low attack complexity.
Which deployments should be prioritized for review?
Prioritize systems using Microsoft 365 Apps for Enterprise, Office Online Server, Office LTSC 2021 or 2024 for 32-bit or 64-bit editions, Office 365 for Mac, and Office LTSC for Mac 2021 or 2024.
How can I determine whether my environment is in scope?
Inventory installed Office products and compare them with the affected software list. The provided information does not identify affected build numbers, fixed versions, or detection indicators.