Untrusted Pointer Dereference in Microsoft Office Word by Microsoft
CVE-2026-45643

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 365 For Mac
Microsoft Office Ltsc 2021
Microsoft Office Ltsc 2024
Vendor
CVE Published:
9 June 2026

What is CVE-2026-45643?

An untrusted pointer dereference vulnerability in Microsoft Office Word could allow an attacker to execute arbitrary code on the user's system. This exploit can be triggered by manipulating the way memory is accessed, potentially leading to unauthorized access and control over the application. Users are encouraged to update their software promptly to mitigate this risk.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 365 for Mac 1.0.0 < 16.110.26061317

Microsoft Office LTSC 2021 32-bit Systems 16.0.1

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

.