Heap-based Buffer Overflow in Microsoft Office Access
CVE-2026-64920

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Access 2016
Microsoft Access 2016 (32-bit Edition)
Microsoft Office 2019
Vendor
CVE Published:
11 August 2026

What is CVE-2026-64920?

A heap-based buffer overflow vulnerability in Microsoft Office Access can be exploited by unauthorized attackers, allowing them to execute code on vulnerable systems. This flaw underscores the necessity for users to apply security updates and follow best practices to safeguard their data and systems from malicious activities.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Access 2016 (32-bit edition) 16.0.0 < 16.0.5565.1000

Microsoft Access 2016 x64-based Systems 16.0.0 < 16.0.5565.1000

References

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

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.