CVE-2026-21264

Critical

Description

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

SeverityCritical

CVSS9.3

Exploit probability—

Product

Microsoft Account

PublishedJan 22, 2026

First seenJan 22, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Patches

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21264

Affected products

Product	Affected versions	Fixed in
microsoft account	No range specified	—

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