Heap-Based Buffer Overflow in Microsoft Office Word
CVE-2026-69764

8.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 2016
Microsoft Office 2019
Microsoft Office Ltsc 2021
Vendor
CVE Published:
8 September 2026

What is CVE-2026-69764?

A heap-based buffer overflow vulnerability in Microsoft Office Word permits unauthorized attackers to execute arbitrary code remotely. If successfully exploited, this flaw could allow attackers to gain unauthorized access to sensitive information or compromise the integrity of the system. Users are urged to apply available patches to mitigate potential risks.

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 < 16.0.5569.1000

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

.