CVE-2026-21264

CRITICAL
2026-01-22 [email protected]
9.3
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 22, 2026 - 23:15 nvd
CRITICAL 9.3

Tags

Microsoft XSS Account

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.

Analysis

Microsoft Account has a cross-site scripting vulnerability allowing unauthenticated attackers to execute scripts in the context of Microsoft Account pages.

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Remediation

Within 24 hours: Inventory all Microsoft Account dependencies and notify security team; activate monitoring for anomalous authentication patterns. Within 7 days: Implement WAF rules to block XSS payloads targeting Microsoft Account endpoints; enforce mandatory password reset for high-risk users; enable MFA enforcement across all accounts. …

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Priority Score

47
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +46
POC: 0

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CVE-2026-21264 vulnerability details – vuln.today
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