CVE-2026-21264

Published: Jan 22, 2026

Modified: Apr 1, 2026

PUBLISHED

CVSS v3.1

9.3

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.

Vendor	Product	Versions
Microsoft	Microsoft Account	affected `-`

Weaknesses (CWE)

CWE-79

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

References

Microsoft Account Spoofing Vulnerability

vendor-advisory

patch

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CVE-2026-21264

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References