CVE-2025-62459Network attack vector

Portal content spoofing via cross-site scripting

Published Nov 20, 2025 · Updated Feb 26, 2026

Cross-site scripting in Microsoft Defender Portal allows remote attackers to spoof portal content through crafted web input. Microsoft has not disclosed the affected portal page, input field, or rendering path that fails to neutralize untrusted input. Exploitation requires user interaction with attacker-controlled content; the hosted-service flaw can expose or alter portal data and interrupt service.

CVSS severity8.3
High
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Microsoft Defender Portal allows remote attackers to spoof portal content through crafted web input. Microsoft has not disclosed the affected portal page, input field, or rendering path that fails to neutralize untrusted input. Exploitation requires user interaction with attacker-controlled content; the hosted-service flaw can expose or alter portal data and interrupt service.

The record

CVE
CVE-2025-62459
Published
Nov 20, 2025
Updated
Feb 26, 2026
Vendor
Microsoft
Product
Microsoft Defender Portal
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft Defender Portalversion=-

Published CVSS scores

6.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
8.3Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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