Heap-based Buffer Overflow in Microsoft Office Products
CVE-2026-45461

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-2026-45461?

A heap-based buffer overflow exists in Microsoft Office that could allow an unauthorized attacker to execute arbitrary code on a user's system. This vulnerability could be triggered when a specially crafted file is opened in affected versions of Microsoft Office products, potentially enabling the attacker to take control of the system and manipulate data or perform other malicious actions. Immediate updates and patches are recommended to safeguard systems from potential exploitation.

Affected Version(s)

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

References

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

CVSS V3.1

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

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.