CVE-2026-77902: 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 16.114.26101123 - 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
Event History
Frequently Asked Questions
Does an attacker need an account or prior privileges to exploit this issue?
No. The vulnerability is rated PR:N, indicating that no attacker privileges are required.
Is user interaction required for exploitation?
Yes. The UI:R rating indicates that exploitation requires user interaction.
Which Office deployments should be assessed?
Assess Microsoft 365 Apps for Enterprise; Microsoft Office 365 for Mac; Office LTSC 2021 for 32-bit and 64-bit editions and for Mac; and Office LTSC 2024 for 32-bit and 64-bit editions and for Mac.