Heap-based Buffer Overflow in Microsoft Office Excel by Microsoft
CVE-2026-100210

8.8HIGH

Key Information:

Vendor

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

What is CVE-2026-100210?

The vulnerability in Microsoft Office Excel is characterized by a heap-based buffer overflow that occurs when the application processes specially crafted Excel files. This vulnerability can be exploited by an unauthorized attacker to execute arbitrary code on affected systems over a network, posing a significant risk to data integrity and confidentiality. Users are advised to apply the latest security updates to mitigate this threat and safeguard their systems.

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 2021 32-bit Systems 16.0.1 < 16.0.14334.20974

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

.