Use After Free Vulnerability in Microsoft Excel
CVE-2026-26107

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Excel 2016
Microsoft Office 2019
Microsoft Office Ltsc 2021
Vendor
CVE Published:
10 March 2026

What is CVE-2026-26107?

A use after free vulnerability in Microsoft Excel can allow an unauthorized attacker to execute arbitrary code locally when manipulating certain Excel components. By exploiting this flaw, malicious entities can gain control over affected systems, potentially leading to unauthorized access and data breaches. It is essential for users to apply the latest security updates to mitigate this risk and safeguard their information.

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Deploy the Patch

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Excel 2016 32-bit Systems 16.0.0.0 < 16.0.5543.1000

Microsoft Office 2019 32-bit Systems 19.0.0

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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