CVE-2026-69680

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Windows DNS Origin Validation Spoofing Vulnerability

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Origin validation error in Windows DNS allows an unauthorized attacker to perform spoofing over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-09

AI Q&A

2026-09-09

EPSS Evaluated

N/A

NVD

CVE-2026-69680

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_dns	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-346	The product does not properly verify that the source of data or communication is valid.

Attack-Flow Graph

Executive Summary

This vulnerability is an origin validation error in Windows DNS that allows an unauthorized attacker to perform spoofing over a network. It enables attackers to impersonate legitimate services or users by exploiting weaknesses in how DNS responses are validated.

Impact Analysis

This vulnerability can lead to man-in-the-middle attacks, where attackers intercept or alter communications between systems. It may allow unauthorized access to sensitive data, enable phishing attacks, or disrupt network services by redirecting traffic to malicious destinations.

Compliance Impact

This vulnerability can lead to data breaches, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information. Non-compliance could result in legal penalties, fines, or reputational damage due to unauthorized access or data exposure.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows DNS vulnerability. Monitor network traffic for unusual DNS queries or responses that may indicate spoofing attempts.

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