Integer Overflow Vulnerability in Microsoft Office Word
CVE-2026-55033

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 2019
Microsoft Office 365 For Mac
Microsoft Office Ltsc 2021
Vendor
CVE Published:
14 July 2026

What is CVE-2026-55033?

An integer overflow vulnerability exists in Microsoft Office Word, which could allow an unauthorized attacker to execute arbitrary code on the affected system. The flaw arises from improper handling of integer calculations, potentially leading to unexpected behavior and exploitation opportunities. Users of affected versions are urged to apply security updates promptly to mitigate risks.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2019 32-bit Systems 19.0.0

Microsoft Office 365 for Mac 1.0.0 < 16.111.26071215

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

.