CVE-2025-62459

HIGH
2025-11-20 [email protected]
8.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

Lifecycle Timeline

2
Analysis Generated
Mar 28, 2026 - 19:23 vuln.today
CVE Published
Nov 20, 2025 - 23:15 nvd
HIGH 8.3

Tags

Microsoft XSS 365 Defender Portal

Description

Microsoft Defender Portal Spoofing Vulnerability

Analysis

Microsoft Defender Portal Spoofing Vulnerability. Rated high severity (CVSS 8.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical Context

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. Affected products include: Microsoft 365 Defender Portal.

Affected Products

Microsoft 365 Defender Portal.

Remediation

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.

Priority Score

42
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +42
POC: 0

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CVE-2025-62459 vulnerability details – vuln.today
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