CVE-2026-45456

HIGH

Microsoft Outlook and Word Remote Code Execution Vulnerability

Title source: cna
STIX 2.1

Description

Access of resource using incompatible type ('type confusion') in Microsoft Office allows an unauthorized attacker to execute code locally.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Microsoft Outlook and Word Remote Code Execution Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45456

Scores

CVSS v3 8.4
EPSS 0.0044
EPSS Percentile 36.1%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-843
Status published
Products (23)
microsoft/365_apps (2 CPE variants)
Microsoft/Microsoft 365 Apps for Enterprise 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office 2019 19.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office 365 for Mac -
Microsoft/Microsoft Office 365 for Mac 1.0.0 - 16.110.26061317
Microsoft/Microsoft Office LTSC 2021 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2024 16.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC for Mac 2021 -
Microsoft/Microsoft Office LTSC for Mac 2021 16.0.1 - 16.110.26061317
Microsoft/Microsoft Office LTSC for Mac 2024 -
... and 13 more
Published Jun 09, 2026
Tracked Since Jun 09, 2026