CVE-2026-40363: Microsoft Office Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Other sources
Microsoft Office 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 16.109.26051019 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5552.1000Patch KB5002866 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.19822.20190
Event History
Frequently Asked Questions
What is the severity of CVE-2026-40363?
CVE-2026-40363 has a high severity rating of 8.4.
What is CVE-2026-40363?
CVE-2026-40363 is a Microsoft Office Remote Code Execution Vulnerability caused by a heap-based buffer overflow.
How can I fix CVE-2026-40363?
Updating Microsoft Office and applying the latest security patches can mitigate CVE-2026-40363.
Which software is affected by CVE-2026-40363?
CVE-2026-40363 affects various versions of Microsoft Office, including Microsoft Office 2016 and Microsoft 365 Apps for Enterprise.
What are the risks associated with CVE-2026-40363?
CVE-2026-40363 allows an unauthorized attacker to execute code locally, posing significant security risks.