Integer Overflow in Microsoft Office Allows Unauthorized Code Execution
CVE-2026-63532

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 2016
Microsoft Office 2019
Microsoft Office 365 For Mac
Vendor
CVE Published:
11 August 2026

What is CVE-2026-63532?

An integer overflow vulnerability in Microsoft Office may allow an attacker to execute arbitrary code on a target system. This issue occurs due to improper handling of integer values, potentially leading to unexpected behavior and exploitation. Attackers can leverage this vulnerability to perform unauthorized actions on affected installations of Microsoft Office, thereby compromising system integrity and data security.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2016 32-bit Systems 16.0.0 < 16.0.5565.1001

Microsoft Office 2019 32-bit Systems 19.0.0

References

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

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.