Remote Code Execution Vulnerability in Microsoft Office Word by Microsoft
CVE-2026-78512

8.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 2016
Microsoft Office 2019
Microsoft Office 365 For Mac
Vendor
CVE Published:
8 September 2026

What is CVE-2026-78512?

A numeric truncation error in Microsoft Office Word enables unauthorized attackers to exploit this vulnerability to execute arbitrary code over a network. This can lead to unauthorized access and manipulation of sensitive data, posing significant risks to user data integrity and security. It is essential for users to be aware of this vulnerability and ensure timely application of available patches to protect their systems.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1 < 16.0.20326.20138

Microsoft Office 2016 32-bit Systems 16.0.0 < 16.0.5569.1002

Microsoft Office 2019 32-bit Systems 19.0.0 < 16.0.10417.20207

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.