Untrusted Pointer Dereference in Microsoft Office Word by Microsoft
CVE-2026-45457

7.8HIGH

Key Information:

Vendor

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

What is CVE-2026-45457?

An untrusted pointer dereference vulnerability in Microsoft Office Word allows a malicious actor to potentially execute arbitrary code on the system. This flaw can be exploited if the user opens a specially crafted file, leading to local code execution and possible system compromise. Users are advised to update their software to mitigate associated risks. For detailed guidance and remediation, refer to the official advisory.

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 for Mac 2021 16.0.1 < 16.110.26061317

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

.