CVE-2026-42831 - Vulnerability Details - OpenCVE

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact total

Vendors	Products
Microsoft	Office Office For Android Office Macos 2021 Office Macos 2024

No data.

No data.

References

Link	Providers
https://www.spirityenterprise.com/managed-detection-response-microsoft
https://www.spirityenterprise.com/pentest
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42831

History

Wed, 13 May 2026 10:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 13 May 2026 10:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Microsoft office For Android
Vendors & Products		Microsoft office For Android

Tue, 12 May 2026 17:30:00 +0000

Type	Values Removed	Values Added
Description		Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Title		Microsoft Office Remote Code Execution Vulnerability
First Time appeared		Microsoft Microsoft office Microsoft office Macos 2021 Microsoft office Macos 2024
Weaknesses		CWE-122
CPEs		cpe:2.3:a:microsoft:office:::android:::::* cpe:2.3:a:microsoft:office_macos_2021::::::long_term_servicing_channel::* cpe:2.3:a:microsoft:office_macos_2024::::::long_term_servicing_channel::*
Vendors & Products		Microsoft Microsoft office Microsoft office Macos 2021 Microsoft office Macos 2024
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42831
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}`

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-05-12T16:59:01.000Z

Updated: 2026-05-13T17:58:52.972Z

Reserved: 2026-04-30T14:51:12.703Z

Link: CVE-2026-42831

Vulnrichment

Updated: 2026-05-13T09:59:57.006Z

NVD

Status : Awaiting Analysis

Published: 2026-05-12T18:17:25.673

Modified: 2026-05-13T15:34:52.573

Link: CVE-2026-42831

Redhat

No data.

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