CVE-2026-63533: 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 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-2026-63533?
CVE-2026-63533 has a severity rating of high, with a score of 7.8.
How do I fix CVE-2026-63533?
To fix CVE-2026-63533, users should apply the latest security updates provided by Microsoft for their version of Office.
What products are affected by CVE-2026-63533?
CVE-2026-63533 affects Microsoft Office 2016, Microsoft 365 Apps for Enterprise, Microsoft 365 Apps, Microsoft Office 2019, Microsoft Office 2021, Microsoft Office 2024, Microsoft Office 365 for Mac, and Microsoft Office LTSC 2024.
What type of vulnerability is CVE-2026-63533?
CVE-2026-63533 is classified as a heap-based buffer overflow vulnerability.
Can CVE-2026-63533 lead to unauthorized access?
Yes, CVE-2026-63533 allows an unauthorized attacker to execute code locally on the affected systems.