CVE-2026-45484

Microsoft SharePoint Elevation of Privilege Vulnerability

CVE-2026-45484 is fixed in 3 products on 1 platform, first by KB5002880, released June 9, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.8

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.3354

98th percentile

<p>Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft SharePoint Enterprise Server 2016	KB5002880	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
Deserialization of Untrusted Data
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45484

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