Microsoft Office Remote Code Execution Vulnerability
CVE-2026-45463

8.4HIGH

Key Information:

Vendor: Microsoft
Status: Microsoft 365 Apps For Enterprise; Microsoft Office 2016; Microsoft Office 2019; Microsoft Office 365 For Mac
Vendor: CVE Published:; 9 June 2026

What is CVE-2026-45463?

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2016 32-bit Systems 16.0.0 < 16.0.5556.1005

Microsoft Office 2019 32-bit Systems 19.0.0

Score:

8.4

Severity:

HIGH

Confidentiality:

High

Integrity:

High

Availability:

High

Attack Vector:

Local

Attack Complexity:

Low

Privileges Required:

None

User Interaction:

None

Scope:

Unchanged

Download the Critical Vulnerability Management Cheat Sheet

CVE-2026-45463 Data