CVE-2026-42831

Microsoft Office Remote Code Execution Vulnerability

Published May 12, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Description
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Microsoft 365 Copilot
CPEs cpe:2.3:a:microsoft:office:*:*:*:*:*:android:*:* cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:*
Vendors & Products Microsoft 365 Copilot
Type Values Removed Values Added
First Time appeared Microsoft office Long Term Servicing Channel
CPEs cpe:2.3:a:microsoft:office:2021:*:*:*:ltsc:macos:*:* cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*
Vendors & Products Microsoft office Long Term Servicing Channel
Type Values Removed Values Added
CPEs cpe:2.3:a:microsoft:office:*:*:*:*:*:android:*:*
cpe:2.3:a:microsoft:office:2021:*:*:*:ltsc:macos:*:*
cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:macos:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

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

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Aug 10, 2026, 3:13 PM
Reserved
Apr 30, 2026, 2:51 PM
Status
Analyzed
Published
May 12, 2026, 6:17 PM
Modified
Oct 26, 2026, 12:10 AM