CVE-2026-70328

Analyzed Analyzed - Analysis Complete

Microsoft Office Excel Out-of-Bounds Read Vulnerability

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:
Percentile:

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-2026-70328

EUVD

EUVD-2026-56584

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 information over a network by reading data beyond the intended memory buffer.

Detection Guidance

This vulnerability involves an out-of-bounds read in Microsoft Office Excel. Detection typically requires monitoring for suspicious Excel file processing or network activity. Check for unusual memory access patterns or crashes in Excel processes. Use system logs to identify unexpected Excel behavior or network connections initiated by Excel.

Impact Analysis

An attacker could exploit this to access sensitive data stored in Excel files, potentially leading to unauthorized information disclosure. This may include confidential or proprietary data.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA if it results in unauthorized access to personal or health data. Organizations may face penalties for failing to protect sensitive information.

Mitigation Strategies

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

Hi! I’m here to help you understand CVE-2026-70328. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70