CVE-2026-108443

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Microsoft Office Word Off-by-One Code Execution

Publication date: 2026-10-15

Last updated on: 2026-10-17

Assigner: Microsoft Corporation

Description

Off-by-one error in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-15

Last Modified

2026-10-17

Generated

2026-10-19

AI Q&A

2026-10-16

EPSS Evaluated

2026-10-18

NVD

CVE-2026-108443

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Microsoft	365 Apps for Enterprise 16.0.1
Microsoft	Microsoft	Office 365 for Mac 1.0.0
Microsoft	Microsoft	Office LTSC 2021 16.0.1
Microsoft	Microsoft	Office LTSC 2024 16.0.0
Microsoft	Microsoft	Office LTSC for Mac 2021 16.0.1
Microsoft	Microsoft	Office LTSC for Mac 2024 16.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-193	A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.

Attack-Flow Graph

Executive Summary

This is an off-by-one error in Microsoft Office Word that could allow an unauthorized attacker to execute arbitrary code over a network. Off-by-one errors typically involve incorrect boundary checks in code, leading to memory corruption or unintended behavior.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your device. This is especially risky if you handle sensitive documents or use Office Word regularly.

Compliance Impact

This vulnerability allows unauthorized code execution over a network, which could lead to unauthorized access to sensitive data. This may violate compliance requirements under GDPR (data protection) and HIPAA (health information privacy) by enabling data breaches or unauthorized data exposure.

Mitigation Strategies

Apply the latest security updates from Microsoft for affected Office products. Disable automatic opening of Office documents from untrusted sources. Monitor network traffic for suspicious activity related to Office applications.

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