CVE-2026-45455
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Out-of-bounds Read in Microsoft Office Excel

Vulnerability report for CVE-2026-45455, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-06-09

Last updated on: 2026-06-19

Assigner: Microsoft Corporation

Description

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

CVSS Scores

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Meta Information

Published
2026-06-09
Last Modified
2026-06-19
Generated
2026-06-30
AI Q&A
2026-06-09
EPSS Evaluated
2026-06-28
NVD
EUVD

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

Attack-Flow Graph

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Executive Summary

This vulnerability is an out-of-bounds read issue in Microsoft Office Excel. It allows an unauthorized attacker to read data beyond the intended memory boundaries, which can lead to the disclosure of sensitive information over a network.

Impact Analysis

The impact of this vulnerability is information disclosure. An attacker exploiting this flaw could gain access to sensitive information from your system without authorization, potentially compromising confidentiality.

Mitigation Strategies

The vulnerability is an out-of-bounds read in Microsoft Office Excel that allows unauthorized information disclosure over a network.

To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft as soon as they become available.

Compliance Impact

This vulnerability allows an unauthorized attacker to disclose information over a network due to an out-of-bounds read in Microsoft Office Excel.

Such information disclosure could potentially impact compliance with data protection regulations like GDPR and HIPAA, which require safeguarding sensitive information from unauthorized access.

However, the provided information does not specify exact compliance implications or affected data types.

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