CVE-2026-102858

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

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102858	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:microsoft:microsoft_365:-:::::macos::
	cpe:2.3:a:microsoft:office_2021:-::::ltsc:macos:-:
	cpe:2.3:a:microsoft:office_2024:-::::ltsc:macos:-:

History

15 Oct 2026, 17:29

Type	Values Removed	Values Added
First Time		Microsoft office 2024 Microsoft Microsoft microsoft 365 Microsoft office 2021
CPE		cpe:2.3:a:microsoft:microsoft_365:-:::::macos:: cpe:2.3:a:microsoft:office_2024:-::::ltsc:macos:-: cpe:2.3:a:microsoft:office_2021:-::::ltsc:macos:-:
References	~~() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102858 -~~	() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102858 - Vendor Advisory

13 Oct 2026, 19:25

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-13 19:17

Updated : 2026-10-15 21:17

NVD link : CVE-2026-102858

Mitre link : CVE-2026-102858

CVE.ORG link : CVE-2026-102858

JSON object : View

Products Affected

microsoft

office_2024
office_2021
microsoft_365

CWE

CWE-122

Heap-based Buffer Overflow

{"id": "CVE-2026-102858", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-102858", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-10-13T21:14:27.548257Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "secure@microsoft.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "secure@microsoft.com", "affectedData": [{"vendor": "Microsoft", "product": "Microsoft Office 365 for Mac", "versions": [{"status": "affected", "version": "1.0.0", "lessThan": "16.114.26101123", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Microsoft Office LTSC for Mac 2021", "versions": [{"status": "affected", "version": "16.0.1", "lessThan": "16.114.26101123", "versionType": "custom"}]}, {"vendor": "Microsoft", "product": "Microsoft Office LTSC for Mac 2024", "versions": [{"status": "affected", "version": "16.0.0", "lessThan": "16.114.26101123", "versionType": "custom"}]}]}], "published": "2026-10-13T19:17:50.217", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102858", "tags": ["Vendor Advisory"], "source": "secure@microsoft.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "secure@microsoft.com", "description": [{"lang": "en", "value": "CWE-122"}]}], "descriptions": [{"lang": "en", "value": "Heap-based buffer overflow in Microsoft Office OneNote allows an unauthorized attacker to execute code over a network."}], "lastModified": "2026-10-15T21:17:00.603", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*", "vulnerable": true, "matchCriteriaId": "12418BDE-FA2E-4BBF-8E47-45C505399898"}, {"criteria": "cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*", "vulnerable": true, "matchCriteriaId": "0DB3EBBF-E0C4-4D5A-8D22-107463AD1DE4"}, {"criteria": "cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*", "vulnerable": true, "matchCriteriaId": "589B470B-9C2E-41E2-A44D-D8CCB4D2F933"}], "operator": "OR"}]}], "sourceIdentifier": "secure@microsoft.com"}