CVE-2026-62870
Received Received - Intake

Use After Free in Microsoft Office Excel Allows Remote Code Execution

Publication date: 2026-08-04

Last updated on: 2026-08-04

Assigner: Microsoft Corporation

Description
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

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Meta Information

Published
2026-08-04
Last Modified
2026-08-04
Generated
2026-08-04
AI Q&A
2026-08-04
EPSS Evaluated
N/A
NVD
CVE-2026-62870
EUVD
EUVD-2026-52536

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-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Executive Summary

This is a use-after-free vulnerability in Microsoft Office Excel. It allows an unauthorized attacker to execute arbitrary code remotely by exploiting a memory management flaw where a program continues to use memory after it has been freed.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your computer. Opening a specially crafted Excel file could trigger the exploit.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, violating GDPR's data protection requirements or 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 immediately to patch the use-after-free vulnerability. Disable Excel macros if not required and restrict network access to Office applications until patched.

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