CVE-2026-63532

Analyzed Analyzed - Analysis Complete

Integer Overflow in Microsoft Office Leads to Code Execution

Publication date: 2026-08-11

Last updated on: 2026-08-13

Assigner: Microsoft Corporation

Description

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to execute code locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-13

Generated

2026-09-01

AI Q&A

2026-08-11

EPSS Evaluated

2026-08-30

NVD

CVE-2026-63532

EUVD

EUVD-2026-56698

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	office_2019	*
microsoft	office_2019	*
microsoft	office_2016	*
microsoft	office_2016	*
microsoft	microsoft_365	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_2024	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer overflow or wraparound flaw in Microsoft Office. It allows an unauthorized attacker to execute arbitrary code on a local system by exploiting how the software handles integer calculations.

Detection Guidance

This vulnerability involves an integer overflow in Microsoft Office allowing local code execution. Detection requires checking for unpatched Office installations or suspicious Office-related processes. Monitor for unexpected Office application crashes or unusual network connections from Office processes. Use Microsoft's official update tool to verify patch status.

Impact Analysis

An attacker could exploit this to run malicious code on your computer, potentially stealing data, installing malware, or taking control of your system. It requires user interaction, such as opening a specially crafted file.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations must patch systems to maintain compliance.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office products immediately. Monitor the Microsoft Security Response Center for patches and disable Office macros if not required.

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