CVE-2026-63523

Medium

Description

Improper neutralization of input during web page generation ('cross-site scripting') in Skype for Business allows an unauthorized attacker to perform spoofing over a network.

SeverityMedium

CVSS6.5

Exploit probability—

Product

Microsoft Skype For Business Server

PublishedSep 8, 2026

First seenSep 8, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Patches

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63523

Affected products

Product	Affected versions	Fixed in
microsoft skype_for_business_server	2015, 2019	—
microsoft skype_for_business_server_subscription_edition	7.0.2046.849	—

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