CVE-2026-64903: Microsoft Office Remote Code Execution Vulnerability
Integer overflow or wraparound 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 16.112.26081010 - 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 16.0.5565.1001Patch KB5002897
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64903?
The severity of CVE-2026-64903 is rated high with a score of 7.8.
How does CVE-2026-64903 affect Microsoft Office?
CVE-2026-64903 allows an unauthorized attacker to execute code locally through an integer overflow vulnerability in Microsoft Office.
Which versions of Microsoft Office are vulnerable to CVE-2026-64903?
CVE-2026-64903 affects Microsoft Office 2016, Microsoft 365 Apps for Enterprise, Microsoft Office LTSC for Mac 2024, and various editions of Microsoft Office LTSC 2021 and 2024.
How do I fix CVE-2026-64903?
To fix CVE-2026-64903, ensure that you apply the latest security updates provided by Microsoft for your affected Office application.
Can exploiting CVE-2026-64903 lead to data loss?
Yes, exploiting CVE-2026-64903 could potentially lead to data loss since it allows for remote code execution, which may compromise system integrity.