CVE-2026-21264 — CRITICAL (9.3)

Vulnerability 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.

CVSS Score

9.3

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Affected Products

Vendor	Product	Versions
Microsoft	Account	-

Related Weaknesses (CWE)

CWE-79

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21264Vendor Advisory

FAQ

What is CVE-2026-21264?

CVE-2026-21264 is a vulnerability with a CVSS score of 9.3 (CRITICAL). Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allows an unauthorized attacker to perform spoofing over a network.

How severe is CVE-2026-21264?

CVE-2026-21264 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-21264?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Account.