CVE-2026-45463: Microsoft Office Remote Code Execution Vulnerability
Integer underflow (wrap 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 https://aka.ms/OfficeSecurityReleases - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.110.26061317 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5556.1005Patch KB5002878 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.20131.20024
Event History
Frequently Asked Questions
What is the severity of CVE-2026-45463?
CVE-2026-45463 has a severity rating of 8.4, categorized as high risk.
How do I fix CVE-2026-45463?
To fix CVE-2026-45463, ensure that your Microsoft Office applications are updated to the latest security patches provided by Microsoft.
What type of vulnerability is CVE-2026-45463?
CVE-2026-45463 is a heap-based buffer overflow vulnerability in Microsoft Office.
Which Microsoft Office versions are affected by CVE-2026-45463?
CVE-2026-45463 affects Microsoft Office 2016, Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 2021, Microsoft Office 2024, and Microsoft Office LTSC 2021 for 64-bit editions.
Can CVE-2026-45463 allow for remote code execution?
Yes, CVE-2026-45463 can allow an unauthorized attacker to execute code locally on vulnerable Microsoft Office installations.