CVE-2026-108439: Microsoft Office Word Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Other sources
Microsoft Office Word 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 16.0.14334.20974 - 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 16.114.26101123 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.21056
Event History
Frequently Asked Questions
What does an attacker need to exploit this vulnerability?
The attack vector is network-based, requires no privileges, and has low attack complexity. Exploitation requires user interaction.
Which deployments should be prioritized for review?
Review Microsoft 365 Apps for Enterprise; Office LTSC 2021 and 2024 for 32-bit and 64-bit editions; and Office 365 for Mac and Office LTSC for Mac 2021 and 2024. The provided data does not distinguish affected configurations within these products.
What is the potential impact of successful exploitation?
A successful attacker could execute code through a heap-based buffer overflow in Word. The CVSS vector indicates high impacts to confidentiality, integrity, and availability.