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CVE-2025-21402

Target: Microsoft Office - OneNote

Microsoft CVSS 7.8 Updated March 10, 2026
Threat Level HIGH

Executive Risk Summary

"A remote code execution vulnerability exists in Microsoft Office OneNote, which could allow an attacker to execute arbitrary code on the affected system. This vulnerability can be exploited by convincing a user to open a specially crafted OneNote file."

Operational Audit Arsenal

Target Type Application
Target Asset Microsoft Office OneNote
Standard Path Client Workstations and Servers
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: Microsoft Office OneNote (Application)
$Target = "Microsoft Office OneNote"
$SearchPaths = @("$env:windir\System32", "$env:ProgramFiles", "${env:ProgramFiles(x86)}")

Get-ChildItem -Path $SearchPaths -Filter $Target -Recurse -ErrorAction SilentlyContinue | 
Select-Object FullName, @{Name="Version";Expression={$_.VersionInfo.ProductVersion}}

Patch Impact Forecast

Reboot Required Required
Service Disruption

Low to Moderate

Internal Work Notes

Apply the latest security updates from Microsoft to mitigate the vulnerability, and consider implementing additional security measures such as restricting access to OneNote files from untrusted sources.

Intelligence Sources

Scope of Impact

Office (Version 2024) Onenote Office (Version 2021)

Original NVD Description

"Microsoft Office OneNote Remote Code Execution Vulnerability"

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.