CVE-2026-66316
Received Received - Intake

Microsoft Edge Spoofing Vulnerability via Origin Validation Error

Publication date: 2026-08-04

Last updated on: 2026-08-04

Assigner: Microsoft Corporation

Description
Origin validation error in Microsoft Edge (Chromium-based) allows an unauthorized attacker to perform spoofing over a network.

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Meta Information

Published
2026-08-04
Last Modified
2026-08-04
Generated
2026-08-04
AI Q&A
2026-08-04
EPSS Evaluated
N/A
NVD
CVE-2026-66316
EUVD
EUVD-2026-52528

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft edge *

Helpful Resources

Exploitability

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

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Executive Summary

This vulnerability is an origin validation error in Microsoft Edge (Chromium-based). It allows an unauthorized attacker to perform spoofing over a network, potentially tricking users into interacting with malicious content that appears legitimate.

Impact Analysis

This vulnerability could allow attackers to impersonate trusted websites or services, leading to phishing attacks, credential theft, or unauthorized actions on behalf of the user. It may expose sensitive data or enable further exploitation of user systems.

Mitigation Strategies

Update Microsoft Edge to the latest version to patch the origin validation error. Disable unnecessary network services and monitor for suspicious activity.

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