Type Confusion Vulnerability in Microsoft Office Software
CVE-2026-45456

8.4HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 2019
Microsoft Office 365 For Mac
Microsoft Office Ltsc 2021
Vendor
CVE Published:
9 June 2026

What is CVE-2026-45456?

A vulnerability in Microsoft Office allows attackers to exploit a type confusion condition within the software. This flaw can enable unauthorized individuals to execute arbitrary code locally, potentially compromising the integrity of the affected systems and exposing sensitive data. Users are highly encouraged to update their Microsoft Office applications to mitigate this security risk.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2019 32-bit Systems 19.0.0

Microsoft Office 365 for Mac 1.0.0 < 16.110.26061317

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

.