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CVE Number Vulnerability Product Severity Date
CVE-2026-64910 Microsoft Office Remote Code Execution Vulnerability Microsoft Office, Microsoft 365 Apps Critical 01-09-2026

Technical Information

An unauthenticated attacker could exploit an untrusted pointer dereference by tricking a user into opening a malicious Office file enabling arbitrary code execution on the local system.

Patch release date: Aug 11, 2026
Further information on this vulnerability is available at : CVE-2026-64910

Affected Software

Microsoft Office 2019 for 32-bit editions,
Microsoft Office 2019 for 64-bit editions,
Microsoft 365 Apps for Enterprise for 32-bit Systems,
Microsoft 365 Apps for Enterprise for 64-bit Systems,
Microsoft Office LTSC for Mac 2021,
Microsoft Office LTSC 2021 for 64-bit editions,
Microsoft Office LTSC 2021 for 32-bit editions,
Microsoft Office LTSC 2024 for 32-bit editions,
Microsoft Office LTSC 2024 for 64-bit editions,
Microsoft Office LTSC for Mac 2024,
Microsoft Office 365 for Mac