CVE-2026-70318
Received Received - Intake

Improper Input Validation in Microsoft Office Excel

Publication date: 2026-08-11

Last updated on: 2026-08-11

Assigner: Microsoft Corporation

Description
Improper input validation in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.

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Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-70318
EUVD
EUVD-2026-56574

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft office_excel *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

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Executive Summary

This vulnerability is an improper input validation flaw in Microsoft Office Excel that allows an unauthorized attacker to disclose information locally. It does not require user interaction beyond normal use and has a base severity score of 5.5.

Impact Analysis

An attacker could exploit this to access sensitive information stored in Excel files on your local system. The impact is limited to local disclosure and does not allow code execution or system compromise.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Excel to address the improper input validation issue. Monitor Microsoft's official security advisories for patches and follow their recommended mitigation steps.

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