CVE-2026-68806

Analyzed Analyzed - Analysis Complete

Out-of-bounds Write in Microsoft Office Excel

Publication date: 2026-08-11

Last updated on: 2026-08-13

Assigner: Microsoft Corporation

Description

Out-of-bounds write in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-13

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-68806

EUVD

EUVD-2026-56459

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	excel	2016
microsoft	excel	2016
microsoft	office_2019	*
microsoft	office_2019	*
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-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds write issue in Microsoft Office Excel. It allows an unauthorized attacker to execute arbitrary code on a victim's system by exploiting memory corruption in Excel. This occurs when the program writes data outside the intended memory buffer, potentially leading to code execution.

Detection Guidance

Detection of this vulnerability requires monitoring for unusual Excel file behavior or crashes. Check for out-of-bounds write attempts in Excel processes using system monitoring tools like Process Monitor or Windows Event Viewer. Look for suspicious Excel file execution patterns or memory corruption events.

Impact Analysis

An attacker could exploit this to run malicious code on your computer if you open a specially crafted Excel file. This could lead to data theft, installation of malware, or full system compromise. The attack requires user interaction, such as opening a malicious file.

Compliance Impact

This vulnerability allows remote code execution through an out-of-bounds write in Microsoft Office Excel. While not explicitly linked to compliance standards in the provided text, such vulnerabilities can potentially lead to unauthorized data access or modification, which may impact GDPR (data protection) and HIPAA (health data privacy) compliance if sensitive data is involved.

Mitigation Strategies

Apply the latest security updates from Microsoft for Excel as soon as possible to patch the out-of-bounds write vulnerability.

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