Heap-based Buffer Overflow in Microsoft Office Outlook by Microsoft
CVE-2026-108448

7.5HIGH

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:
15 October 2026

What is CVE-2026-108448?

A vulnerability exists in Microsoft Office Outlook that enables an unauthorized attacker to execute arbitrary code remotely via a heap-based buffer overflow. This issue arises due to improper handling of input, potentially allowing for malicious exploitation over a network. Microsoft has released a detailed advisory outlining the affected products and subsequent patches to mitigate this security risk.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 365 for Mac 1.0.0 < 16.114.26101123

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:
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

.