Remote Code Execution Flaw in Microsoft Office Excel Can Be Exploited
CVE-2026-100212

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-2026-100212?

A vulnerability in Microsoft Office Excel permits unauthorized attackers to execute arbitrary code via network access. This occurs due to improper handling of memory, particularly during use after free conditions. As such, users may be exposed to potential malware attacks if the vulnerability is exploited. Keeping Excel up to date with the latest security patches is essential to mitigate risks associated with this flaw.

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

.