CVE-2026-65661: 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 16.0.5565.1001Fixed in 16.0.5565.1000Patch KB5002900
Event History
Frequently Asked Questions
What is the severity of CVE-2026-65661?
CVE-2026-65661 has a high severity rating of 7.8.
What is CVE-2026-65661?
CVE-2026-65661 is a heap-based buffer overflow vulnerability in Microsoft Office that allows unauthorized remote code execution.
Which Microsoft Office versions are affected by CVE-2026-65661?
CVE-2026-65661 affects Microsoft Office 2016, Microsoft 365 Apps for Enterprise, Microsoft Office 2019, and Microsoft Office LTSC versions.
How do I fix CVE-2026-65661?
To fix CVE-2026-65661, install the latest security updates provided by Microsoft for the affected Office versions.
What are the potential impacts of CVE-2026-65661?
The potential impacts of CVE-2026-65661 include unauthorized code execution, which could lead to data loss or system compromise.