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CVE-2026-21264— Microsoft Account Spoofing Vulnerability

Quick assessment

Affected
Microsoft Microsoft Account
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Account是美国微软（Microsoft）公司的一个账户服务。 Microsoft Account存在安全漏洞，该漏洞源于在网页生成过程中输入的中和不当。

CVSS 9.3 · Critical EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Microsoft Microsoft Account - affected
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I. Basic Information for CVE-2026-21264

Vulnerability Information
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Vulnerability Title
Microsoft Account Spoofing Vulnerability
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Account 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Account是美国微软（Microsoft）公司的一个账户服务。 Microsoft Account存在安全漏洞，该漏洞源于在网页生成过程中输入的中和不当。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft Account - -

II. Public POCs for CVE-2026-21264

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III. Intelligence Information for CVE-2026-21264

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Same Patch Batch · Microsoft · 2026-01-22 · 8 CVEs total

CVE-2026-24306 9.8 CRITICAL Azure Front Door Elevation of Privilege Vulnerability
CVE-2026-24307 9.3 CRITICAL M365 Copilot Information Disclosure Vulnerability
CVE-2026-24305 9.3 CRITICAL Azure Entra ID Elevation of Privilege Vulnerability
CVE-2026-21227 8.2 HIGH Azure Logic Apps Elevation of Privilege Vulnerability
CVE-2026-21520 7.5 HIGH Copilot Studio Information Disclosure Vulnerability
CVE-2026-21521 7.4 HIGH Word Copilot Information Disclosure Vulnerability
CVE-2026-21524 7.4 HIGH Azure Data Explorer Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft Account
Same vendor: Microsoft
Same weakness: CWE-79

V. Comments for CVE-2026-21264

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