CVE-2026-88186: 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 16.0.17932.21056 - 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 16.0.14334.20974
Event History
Frequently Asked Questions
Which deployments should be prioritized for assessment?
Assess systems running any listed Microsoft Word or Office product: Microsoft 365 Apps for Enterprise, Microsoft Office Word, Office LTSC 2021 or 2024 for 32-bit or 64-bit editions, Office 365 for Mac, and Office LTSC for Mac 2024. The available data does not identify affected version ranges within those products.
What level of attacker access is required?
The vulnerability is network-reachable, requires no privileges, and has low attack complexity. Exploitation does require user interaction.
What could successful exploitation allow?
A successful heap-based buffer overflow could allow an unauthorized attacker to execute code. The supplied severity data indicates high impact to confidentiality, integrity, and availability.