What is CVE-2026-102858?

CVE-2026-102858 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Microsoft Office OneNote Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-102858 cover?

CVE-2026-102858 covers the following CVE IDs: CVE-2026-102858. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-102858?

CVE-2026-102858 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-102858?

CVE-2026-102858 affects 3 products, including: Microsoft Office 365 for Mac; Microsoft Office LTSC for Mac 2021; Microsoft Office LTSC for Mac 2024.

CVE-2026-102858HighCVSS 8.8

Microsoft Office OneNote Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

October 13, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-102858 →

📋 Description

Heap-based buffer overflow in Microsoft Office OneNote allows an unauthorized attacker to execute code over a network.

🎯 Affected products3

Microsoft Office 365 for Mac
Microsoft Office LTSC for Mac 2021
Microsoft Office LTSC for Mac 2024

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (1)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102858