CVE-2026-55034

High

Description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

SeverityHigh

CVSS7.3

Exploit probability—

Product

Microsoft Sharepoint Server

PublishedJul 14, 2026

First seenJul 14, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

microsoft sharepoint_server16.0.19725.20434 or later

Patches

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55034

Affected products

Product	Affected versions	Fixed in
microsoft sharepoint_server	v < 16.0.19725.20434, 2016, 2019	16.0.19725.20434

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