Untrusted Pointer Dereference in Microsoft Office Excel by Microsoft
CVE-2026-20955

7.8HIGH

Key Information:

Vendor

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

What is CVE-2026-20955?

The vulnerability in Microsoft Office Excel arises from an untrusted pointer dereference issue, which can allow unauthorized users to execute code on affected systems. This flaw poses a significant risk, potentially enabling malware execution through specially crafted documents. Users are encouraged to apply recommended security patches promptly to mitigate this vulnerability.

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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 LTSC 2021 x64-based 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

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