Use After Free Vulnerability in Microsoft Office
CVE-2026-20952

8.4HIGH

Key Information:

Vendor

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

What is CVE-2026-20952?

A use after free vulnerability in Microsoft Office could allow an unauthorized attacker to execute code locally on affected systems. Exploitations of this vulnerability could lead to unauthorized access and potential data compromise. Users are advised to apply the latest security patches to mitigate this risk and ensure their systems remain secure.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2016 32-bit Systems 16.0.0 < 16.0.5535.1000

Microsoft Office 2019 x64-based 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

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