Spoofing Vulnerability in Microsoft Defender Portal
CVE-2025-62459

8.3HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Defender Portal
Vendor
CVE Published:
20 November 2025

What is CVE-2025-62459?

The Microsoft Defender Portal is susceptible to a spoofing vulnerability that allows an attacker to impersonate legitimate users. This flaw can potentially be exploited to manipulate data, gain unauthorized access, and undermine the integrity of security measures. Organizations utilizing this portal must implement necessary safeguards and monitoring to protect against possible exploitation.

Affected Version(s)

Microsoft 365 Defender Portal Unknown

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
8.3
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-62459 : Spoofing Vulnerability in Microsoft Defender Portal