CVE-2026-42831

HIGH

Microsoft Office Remote Code Execution Vulnerability

Title source: cna
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Microsoft Office Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42831

Scores

CVSS v3 7.8
EPSS 0.0006
EPSS Percentile 19.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-122
Status published
Products (7)
Microsoft/Microsoft Office for Android 16.0.1 - 16.0.19822.20190
Microsoft/Microsoft Office LTSC for Mac 2021 16.0.1 - 16.109.26051019
Microsoft/Microsoft Office LTSC for Mac 2024 16.0.0 - 16.109.26051019
microsoft/office 2021
microsoft/office 2024
microsoft/office < 16.0.19822.20190
microsoft/office_long_term_servicing_channel 2021
Published May 12, 2026
Tracked Since May 12, 2026