CVE-2026-70327

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in Microsoft Office Excel

Publication date: 2026-08-11

Last updated on: 2026-08-13

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

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-2026-70327

EUVD

EUVD-2026-56583

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-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds read flaw in Microsoft Office Excel. It allows an unauthorized attacker to access and disclose sensitive information over a network without needing special privileges or user interaction.

Detection Guidance

This vulnerability involves an out-of-bounds read in Microsoft Office Excel that could lead to information disclosure. Detection typically requires monitoring for suspicious Excel file processing or network traffic anomalies. Check for unusual Excel file interactions or crashes during file operations. Ensure Excel and system updates are applied to mitigate risks.

Impact Analysis

An attacker could exploit this to read memory contents outside the intended buffer, potentially accessing confidential data stored in Excel files or system memory. This could lead to unauthorized data exposure or further attacks.

Compliance Impact

This vulnerability could lead to unauthorized data disclosure, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Organizations may face compliance penalties if exploited.

Mitigation Strategies

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

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