CVE-2026-45456

Microsoft Outlook and Word Remote Code Execution Vulnerability

CVE-2026-45456 is fixed in 5 products on 1 platform, first by KB5002880, released June 9, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

8.4

Critical

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0044

38th percentile

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

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft SharePoint Enterprise Server 2016	KB5002880	Jun 9, 2026
Microsoft SharePoint Enterprise Server 2016	KB5002881	Jun 9, 2026
Microsoft SharePoint Server 2019	KB5002876	Jun 9, 2026
Microsoft SharePoint Server 2019	KB5002874	Jun 9, 2026
Microsoft SharePoint Server Subscription Edition	KB5002873	Jun 9, 2026
Microsoft Word 2016 (32-bit edition)	KB5002879	Jun 9, 2026
Microsoft Word 2016 (64-bit edition)	KB5002879	Jun 9, 2026

Details

Published
June 9, 2026
Weakness
Access of Resource Using Incompatible Type ('Type Confusion')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45456

For tools and AI agents

This page as data: JSON · Markdown

Link to this page

If this page saved you time, a link to it in your ticket, advisory or write-up helps others find it.

HTML

<a href="https://patchblox.com/security/cve/CVE-2026-45456">CVE-2026-45456 on Patchblox Patch Radar</a>

Reusing the data? How to credit Patch Radar.

Is this on your machines?

Patchblox finds every install below the fixed version on Windows, macOS and Linux, and updates them through your release rings.

Get a demo

Patch Radar data is free to use with attribution. Terms and how to credit it.

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.