CVE-2026-102858 Details
Description
Heap-based buffer overflow in Microsoft Office OneNote allows an unauthorized attacker to execute code over a network.
A heap-based buffer overflow vulnerability has been identified in Microsoft Office OneNote. This vulnerability allows an unauthorized attacker to execute code remotely over a network. The issue arises when a user opens a specially crafted file from the attacker, initiating the code execution. The vulnerability is present in several versions of Microsoft Office for Mac, including Office LTSC 2021, LTSC 2024, and Office 365, as well as in Microsoft Office OneNote for Windows.
Security updates for this vulnerability are available for Microsoft Office LTSC for Mac 2021, 2024, and Microsoft Office 365 for Mac. Users should ensure these updates are installed. For Microsoft Office OneNote for Windows, no specific action is required as the vulnerability is not present in that version.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Oct 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102858 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-122 | Heap-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft microsoft 365 | All versions |
CPE
Remediation
| |
| microsoft office 2021 | All versions |
CPE
Remediation
| |
| microsoft office 2024 | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 15, 2026 | CVE Modified | [email protected] |
| Oct 15, 2026 | Initial Analysis | [email protected] |
| Oct 13, 2026 | CVE Modified | CISA-ADP |
| Oct 13, 2026 | New CVE Received | [email protected] |