CVE-2026-97779

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in Microsoft Office Excel

Publication date: 2026-10-13

Last updated on: 2026-10-15

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

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Meta Information

Published

2026-10-13

Last Modified

2026-10-15

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-97779

EUVD

EUVD-2026-100284

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	microsoft_365	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_online_server	to 16.0.10417.20228 (exc)

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 is an out-of-bounds read vulnerability in Microsoft Office Excel. It allows an unauthorized attacker to read memory outside the intended buffer, potentially exposing sensitive information over a network.

Detection Guidance

This vulnerability involves an out-of-bounds read in Microsoft Office Excel, which may allow information disclosure. Detection typically requires monitoring for unusual network traffic or suspicious Excel file interactions. Use Microsoft Defender for Office 365 to scan for malicious Excel files and enable network traffic monitoring tools like Wireshark to detect anomalous data exfiltration attempts.

Impact Analysis

An attacker could exploit this to access confidential data stored in memory, such as sensitive documents or credentials, without authentication. This may lead to further attacks or data breaches.

Compliance Impact

This vulnerability could result in unauthorized data exposure, violating GDPR and HIPAA requirements for protecting personal and health information. Organizations may face penalties for non-compliance.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the out-of-bounds read vulnerability in Microsoft Office Excel. Monitor Microsoft's official update guide for patches and install them promptly.

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