What is CVE-2026-21264?

CVE-2026-21264 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Microsoft Account Spoofing Vulnerability

Which CVE IDs does CVE-2026-21264 cover?

CVE-2026-21264 covers the following CVE IDs: CVE-2026-21264. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21264?

CVE-2026-21264 has a CVSS v3 base score of 9.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21264?

CVE-2026-21264 affects 1 product, including: Microsoft Account.

CVE-2026-21264CriticalCVSS 9.3

Microsoft Account Spoofing Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21264 →

📋 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.

🎯 Affected products1

Microsoft Account

🔗 References (1)

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