CVE-2026-44819

Microsoft Office Remote Code Execution Vulnerability

CVE-2026-44819 is fixed in 5 products on 1 platform, first by KB5002878, released June 9, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.8

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0046

39th percentile

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

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Office 2016 (32-bit edition)	KB5002878	Jun 9, 2026
Microsoft Office 2016 (64-bit edition)	KB5002878	Jun 9, 2026
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

Details

Published
June 9, 2026
Weakness
Heap-based Buffer Overflow
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44819

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