Remote Code Execution Vulnerability in Microsoft Office Outlook
CVE-2026-100208

7.5HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office Ltsc 2021
Microsoft Office Ltsc 2024
Vendor
CVE Published:
25 September 2026

What is CVE-2026-100208?

An integer overflow vulnerability in Microsoft Office Outlook could enable an unauthorized attacker to execute arbitrary code from a remote location. This security flaw allows for exploitation through crafted emails or malicious attachments, posing a significant risk to users who may inadvertently open such content.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office LTSC 2021 32-bit Systems 16.0.1

Microsoft Office LTSC 2024 32-bit Systems 16.0.0

References

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

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.