Remote Code Execution Vulnerability in Microsoft Office Excel
CVE-2026-100211

8.8HIGH

Key Information:

Vendor

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

What is CVE-2026-100211?

A security vulnerability exists in Microsoft Office Excel where a use-after-free condition could allow an unauthorized attacker to execute arbitrary code over a network. Attackers can exploit this flaw to gain control over affected systems, posing significant risks to data integrity and system security. It is essential for users to apply the recommended patches to mitigate this threat and reinforce their cybersecurity posture. For more details, visit the Microsoft advisory.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 365 for Mac 1.0.0

Microsoft Office LTSC 2024 32-bit Systems 16.0.0 < 16.0.17932.21056

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.